{"id":780,"date":"2024-12-09T11:04:27","date_gmt":"2024-12-09T04:04:27","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=780"},"modified":"2025-01-03T15:56:27","modified_gmt":"2025-01-03T08:56:27","slug":"postgresql-sequence","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-sequence\/","title":{"rendered":"PostgreSQL Sequence"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the PostgreSQL Sequence objects to generate unique integer values.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='getting-started-with-postgresql-sequence'>Getting Started with PostgreSQL Sequence <a href=\"#getting-started-with-postgresql-sequence\" class=\"anchor\" id=\"getting-started-with-postgresql-sequence\" title=\"Anchor for Getting Started with PostgreSQL Sequence\">#<\/a><\/h2>\n\n\n\n<p>In PostgreSQL, a sequence is a database object that generates unique integer values.<\/p>\n\n\n\n<p>To create a new sequence, you use the <code>CREATE SEQUENCE<\/code> statement. Here&#8217;s the basic syntax:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">SEQUENCE<\/span> sequence_name\n\u00a0 \u00a0\u00a0&#91;<span class=\"hljs-keyword\">START<\/span> <span class=\"hljs-keyword\">WITH<\/span> start_value]\n\u00a0 \u00a0\u00a0&#91;<span class=\"hljs-keyword\">INCREMENT<\/span> <span class=\"hljs-keyword\">BY<\/span> increment_value]\n\u00a0 \u00a0\u00a0&#91;<span class=\"hljs-keyword\">MINVALUE<\/span> min_value | NO <span class=\"hljs-keyword\">MINVALUE<\/span>]\n\u00a0 \u00a0\u00a0&#91;<span class=\"hljs-keyword\">MAXVALUE<\/span> max_value | NO <span class=\"hljs-keyword\">MAXVALUE<\/span>]\n\u00a0 \u00a0\u00a0&#91;CYCLE | NO CYCLE]\n\u00a0 \u00a0\u00a0&#91;<span class=\"hljs-keyword\">CACHE<\/span> cache_value | NO <span class=\"hljs-keyword\">CACHE<\/span>]\n\u00a0 \u00a0\u00a0&#91;OWNED <span class=\"hljs-keyword\">BY<\/span> table_name.column_name ];<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>sequence_name<\/code> defines a sequence name, which must be unique within the database.<\/li>\n\n\n\n<li><code>START WITH start_value<\/code> specifies the starting value of the sequence &#8211; the <code>start_value<\/code> defaults to 1.<\/li>\n\n\n\n<li><code>INCREMENT BY increment_value<\/code> determines the value you want to increment the sequence. The <code>increment_value<\/code> default is 1.<\/li>\n\n\n\n<li><code>MINVALUE min_value<\/code><strong>&nbsp;&nbsp;<\/strong>sets the minimum value of the sequence. Use <code>NO MINVALUE<\/code> to set the default to 1 for ascending and -1 for descending sequences.<\/li>\n\n\n\n<li><code>MAXVALUE max_value<\/code> sets the maximum value of the sequence. Use <code>NO MAXVALUE<\/code> to set the default value for <code>max_value<\/code> to the maximum positive integer for ascending and <code>-1<\/code> for descending sequences.<\/li>\n\n\n\n<li><code>CYCLE<\/code> instructs the sequence should restart for the <code>MINVALUE<\/code> for ascending sequences or <code>MAXVALUE<\/code> for descending sequences when it reaches its limit. Use <code>NO CYCLE<\/code> to throw an error if the sequence value reaches the limit.<\/li>\n\n\n\n<li><code>CACHE cache_value<\/code><strong> <\/strong>instructs PostgreSQL to preallocate and store a number of sequence numbers in the memory for faster access\u2014the <code>cache_value<\/code> defaults to 1. Use <code>NO CACHE<\/code> if you want to turn off the cache.<\/li>\n\n\n\n<li><code>OWNED BY table_name.column_name<\/code> associates the sequence with a table column.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='sequence-functions'>Sequence functions <a href=\"#sequence-functions\" class=\"anchor\" id=\"sequence-functions\" title=\"Anchor for Sequence functions\">#<\/a><\/h2>\n\n\n\n<p>PostgreSQL provides some useful functions to work with sequences:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>nextval('sequence_name')<\/code> increments the sequence to its next value and returns that value.<\/li>\n\n\n\n<li><code>currval('sequence_name')<\/code> returns the value most recently obtained by&nbsp;the <code>nextval()<\/code> function&nbsp;for the sequence in the current session.<\/li>\n\n\n\n<li><code>setval('sequence_name', value, is_called)<\/code> manually sets the current value of a sequence.<\/li>\n\n\n\n<li><code>lastval()<\/code> returns the value that the <code>nextval()<\/code> function has recently generated in the current session.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='creating-an-ascending-sequence-example'>Creating an ascending sequence example <a href=\"#creating-an-ascending-sequence-example\" class=\"anchor\" id=\"creating-an-ascending-sequence-example\" title=\"Anchor for Creating an ascending sequence example\">#<\/a><\/h2>\n\n\n\n<p>First, create a new ascending sequence (<code>asc_seq<\/code>) starting with one and incrementing with one:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">SEQUENCE<\/span> asc_seq\n<span class=\"hljs-keyword\">START<\/span> <span class=\"hljs-keyword\">WITH<\/span> <span class=\"hljs-number\">1<\/span> \n<span class=\"hljs-keyword\">INCREMENT<\/span> <span class=\"hljs-keyword\">BY<\/span> <span class=\"hljs-number\">1<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=Q1JFQVRFIFNFUVVFTkNFIGFzY19zZXEgU1RBUlQgV0lUSCAxIElOQ1JFTUVOVCBCWSAxOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Second, advance the sequence <code>asc_seq<\/code> to the next value:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> nextval(<span class=\"hljs-string\">'asc_seq'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=U0VMRUNUIG5leHR2YWwoJ2FzY19zZXEnKTs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> nextval\n<span class=\"hljs-comment\">---------<\/span>\n       <span class=\"hljs-number\">1<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>If you call the <code>nextval()<\/code> function, it continues advancing the <code>asc_seq<\/code> to the next value:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> nextval(<span class=\"hljs-string\">'asc_seq'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=U0VMRUNUIG5leHR2YWwoJ2FzY19zZXEnKTs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> nextval\n<span class=\"hljs-comment\">---------<\/span>\n       <span class=\"hljs-number\">2<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, get the current value of the <code>asc_seq<\/code> sequence:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> currval(<span class=\"hljs-string\">'asc_seq'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=U0VMRUNUIGN1cnJ2YWwgKCdhc2Nfc2VxJyk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> currval\n<span class=\"hljs-comment\">---------<\/span>\n       <span class=\"hljs-number\">2<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='creating-a-descending-sequence-example'>Creating a descending sequence example <a href=\"#creating-a-descending-sequence-example\" class=\"anchor\" id=\"creating-a-descending-sequence-example\" title=\"Anchor for Creating a descending sequence example\">#<\/a><\/h2>\n\n\n\n<p>First, create a new descending sequence (<code>desc_seq<\/code>) with a decrement of -1:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">SEQUENCE<\/span> desc_seq\n<span class=\"hljs-keyword\">INCREMENT<\/span> <span class=\"hljs-keyword\">BY<\/span> <span class=\"hljs-number\">-1<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=Q1JFQVRFIFNFUVVFTkNFIGRlc2Nfc2VxIElOQ1JFTUVOVCBCWSAtMTs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Second, advance the sequence to the next value:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> nextval(<span class=\"hljs-string\">'desc_seq'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=U0VMRUNUIG5leHR2YWwoJ2Rlc2Nfc2VxJyk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> nextval\n<span class=\"hljs-comment\">---------<\/span>\n      <span class=\"hljs-number\">-1<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>If you call the <code>nextval()<\/code> function again, it will advance the <code>desc_seq<\/code> sequence to the next value:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> nextval(<span class=\"hljs-string\">'desc_seq'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=U0VMRUNUIG5leHR2YWwoJ2Rlc2Nfc2VxJyk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> nextval\n<span class=\"hljs-comment\">---------<\/span>\n      <span class=\"hljs-number\">-2<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, get the current value of the <code>desc_seq<\/code> sequence:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> currval(<span class=\"hljs-string\">'desc_seq'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=U0VMRUNUIGN1cnJ2YWwoJ2Rlc2Nfc2VxJyk7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-15\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> currval\n<span class=\"hljs-comment\">---------<\/span>\n      <span class=\"hljs-number\">-2<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='associating-a-sequence-with-a-table-column'>Associating a sequence with a table column <a href=\"#associating-a-sequence-with-a-table-column\" class=\"anchor\" id=\"associating-a-sequence-with-a-table-column\" title=\"Anchor for Associating a sequence with a table column\">#<\/a><\/h2>\n\n\n\n<p>First, <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-create-table\/\">create a new table<\/a> to store the transfer order header:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-16\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> transfer_order_headers (\n  order_no <span class=\"hljs-type\">INT<\/span> <span class=\"hljs-keyword\">GENERATED<\/span> <span class=\"hljs-keyword\">ALWAYS<\/span> <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-keyword\">IDENTITY<\/span> <span class=\"hljs-keyword\">PRIMARY KEY<\/span>,\n  created_at <span class=\"hljs-type\">TIMESTAMPTZ<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">NULL<\/span> <span class=\"hljs-keyword\">DEFAULT<\/span> <span class=\"hljs-built_in\">CURRENT_TIMESTAMP<\/span>,\n  warehouse_id <span class=\"hljs-type\">INT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">NULL<\/span>,\n  movement_type <span class=\"hljs-type\">VARCHAR<\/span>(<span class=\"hljs-number\">20<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">NULL<\/span>\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-create-table\/\">create a new table<\/a> <code>transfer_order_items<\/code> to store order items.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-17\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> transfer_order_items (\n  order_no <span class=\"hljs-type\">INT<\/span>,\n  item_no <span class=\"hljs-type\">INT<\/span>,\n  product_id <span class=\"hljs-type\">INT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">NULL<\/span>,\n  quantity <span class=\"hljs-type\">INT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">NULL<\/span>,\n  from_bin <span class=\"hljs-type\">VARCHAR<\/span>(<span class=\"hljs-number\">20<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">NULL<\/span>,\n  to_bin <span class=\"hljs-type\">VARCHAR<\/span>(<span class=\"hljs-number\">20<\/span>) <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">NULL<\/span>,\n  <span class=\"hljs-keyword\">PRIMARY KEY<\/span> (order_no, item_no),\n  <span class=\"hljs-keyword\">FOREIGN KEY<\/span> (order_no) <span class=\"hljs-keyword\">REFERENCES<\/span> transfer_order_headers(order_no)\n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, create a new sequence associated with the <code>item_no<\/code> column of the <code>transfer_order_items<\/code> table:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-18\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">SEQUENCE<\/span> item_no_seq \n<span class=\"hljs-keyword\">START<\/span> <span class=\"hljs-number\">10<\/span> \n<span class=\"hljs-keyword\">INCREMENT<\/span> <span class=\"hljs-number\">10<\/span> \n<span class=\"hljs-keyword\">MINVALUE<\/span> <span class=\"hljs-number\">10<\/span> \n<span class=\"hljs-keyword\">OWNED<\/span> <span class=\"hljs-keyword\">BY<\/span> transfer_order_items.item_no;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-18\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fourth, set the default value for the <code>item_no<\/code> column using the value generated by the <code>item_no_seq<\/code> sequence:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-19\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">ALTER TABLE transfer_order_items \nALTER COLUMN item_no\nSET <span class=\"hljs-keyword\">DEFAULT<\/span> nextval(<span class=\"hljs-string\">'item_no_seq'<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-19\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fifth, create a new transfer order:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-20\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span>\n  transfer_order_headers (warehouse_id, movement_type)\n<span class=\"hljs-keyword\">VALUES<\/span>\n  (<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'Picking'<\/span>) \n<span class=\"hljs-keyword\">RETURNING<\/span> *;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-20\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=SU5TRVJUIElOVE8gdHJhbnNmZXJfb3JkZXJfaGVhZGVycyAod2FyZWhvdXNlX2lkLCBtb3ZlbWVudF90eXBlKSBWQUxVRVMgKDEsICdQaWNraW5nJykgUkVUVVJOSU5HICo7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> order_no |          created_at           | warehouse_id | movement_type\n----------+-------------------------------+--------------+---------------\n        1 | 2024-12-08 22:45:43.173269-05 |            1 | Picking<\/code><\/span><\/pre>\n\n\n<p>Finally, create three items for the transfer order that moves the product id 1 and 2 from bin <code>A-01<\/code> to <code>B-01<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-21\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span>\n  transfer_order_items (order_no, product_id, quantity, from_bin, to_bin)\n<span class=\"hljs-keyword\">VALUES<\/span>\n  (<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-string\">'A-01'<\/span>, <span class=\"hljs-string\">'B-01'<\/span>),\n  (<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">10<\/span>, <span class=\"hljs-string\">'A-01'<\/span>, <span class=\"hljs-string\">'B-01'<\/span>) \n<span class=\"hljs-keyword\">RETURNING<\/span> *;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-21\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=SU5TRVJUIElOVE8gdHJhbnNmZXJfb3JkZXJfaXRlbXMgKG9yZGVyX25vLCBwcm9kdWN0X2lkLCBxdWFudGl0eSwgZnJvbV9iaW4sIHRvX2JpbikgVkFMVUVTICgxLCAxLCA1LCAnQS0wMScsICdCLTAxJyksICgxLCAyLCAxMCwgJ0EtMDEnLCAnQi0wMScpIFJFVFVSTklORyAqOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\"><span><code class=\"hljs\"> order_no | item_no | product_id | quantity | from_bin | to_bin\n----------+---------+------------+----------+----------+--------\n        1 |      10 |          1 |        5 | A-01     | B-01\n        1 |      20 |          2 |       10 | A-01     | B-01<\/code><\/span><\/pre>\n\n\n<p>The sequence <code>item_no_seq<\/code> automatically generates values for the <code>item_no<\/code> column.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='removing-a-sequence'>Removing a sequence <a href=\"#removing-a-sequence\" class=\"anchor\" id=\"removing-a-sequence\" title=\"Anchor for Removing a sequence\">#<\/a><\/h2>\n\n\n\n<p>You use the <code>DROP SEQUENCE<\/code> statement to remove a sequence:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-22\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">SEQUENCE<\/span> &#91;<span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">EXISTS<\/span>] sequence_name\n&#91;<span class=\"hljs-keyword\">CASCADE<\/span> | <span class=\"hljs-keyword\">RESTRICT<\/span>];<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-22\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, specify the sequence name to drop.<\/li>\n\n\n\n<li>Second, use the <code>CASCADE<\/code> option to remove the sequence and its dependent objects, and in turn, the objects that depend on the dependent objects, and so on.<\/li>\n<\/ul>\n\n\n\n<p>For example, the following statement drops the <code>asc_seq<\/code> from the database:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-23\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">SEQUENCE<\/span> <span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">EXISTS<\/span> asc_seq;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-23\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=RFJPUCBTRVFVRU5DRSBJRiBFWElTVFMgYXNjX3NlcTs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='listing-all-sequences'>Listing all sequences <a href=\"#listing-all-sequences\" class=\"anchor\" id=\"listing-all-sequences\" title=\"Anchor for Listing all sequences\">#<\/a><\/h2>\n\n\n\n<p>To list all sequences in a database, you use the following query:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-24\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"><span class=\"hljs-keyword\">SELECT<\/span> * <span class=\"hljs-keyword\">FROM<\/span> pg_class\n<span class=\"hljs-keyword\">WHERE<\/span> relkind = <span class=\"hljs-string\">'S'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-24\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?db=seq&amp;q=U0VMRUNUICogRlJPTSBwZ19jbGFzcyBXSEVSRSByZWxraW5kID0gJ1MnOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use a sequence to generate unique integers automatically based on a specification.<\/li>\n\n\n\n<li>Use the <code>CREATE SEQUENCE<\/code> statement to create a new sequence.<\/li>\n\n\n\n<li>Use the <code>nextval<\/code> function to advance the sequence to the next value.<\/li>\n\n\n\n<li>Use the <code>currval<\/code> function to get the value that the <code>nextval<\/code> function has recently generated.<\/li>\n\n\n\n<li>Use the <code>setval<\/code> function to set the current value for a sequence manually.<\/li>\n\n\n\n<li>Use the <code>OWNED BY<\/code> clause to associate a sequence with a table column.<\/li>\n\n\n\n<li>Use the <code>DROP SEQUENCE<\/code> statement to remove a sequence.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='quiz'>Quiz <a href=\"#quiz\" 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