{"id":3365,"date":"2024-04-27T20:03:16","date_gmt":"2024-04-27T13:03:16","guid":{"rendered":"https:\/\/www.sqlitetutorial.net\/?page_id=3365"},"modified":"2024-04-27T20:03:46","modified_gmt":"2024-04-27T13:03:46","slug":"sqlite-drop-index","status":"publish","type":"page","link":"https:\/\/www.sqlitetutorial.net\/sqlite-index\/sqlite-drop-index\/","title":{"rendered":"SQLite DROP INDEX Statement"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the SQLite <code>DROP INDEX<\/code> statement to remove an index.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to the SQLite DROP INDEX statement<\/h2>\n\n\n\n<p>The <code>DROP INDEX<\/code> statement allows you to remove an index associated with a table. Here&#8217;s the syntax of the <code>DROP INDEX<\/code> statement:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">INDEX<\/span> &#91;<span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">EXISTS<\/span>] index_name;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/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 name of the index you want to remove after the <code>DROP INDEX<\/code> keywords.<\/li>\n\n\n\n<li>Second, use the optional <code>IF EXISTS<\/code> clause to conditionally delete the index only if it exists.<\/li>\n<\/ul>\n\n\n\n<p>The <code>DROP INDEX<\/code> permanently removes the <code>index_name<\/code> from the SQLite database.<\/p>\n\n\n\n<p>To get all indexes in the current attached database, you use the following statement:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n   <span class=\"hljs-keyword\">name<\/span>, \n   tbl_name, \n   <span class=\"hljs-keyword\">sql<\/span>\n<span class=\"hljs-keyword\">FROM<\/span>\n   sqlite_master\n<span class=\"hljs-keyword\">WHERE<\/span>\n   <span class=\"hljs-keyword\">type<\/span>= <span class=\"hljs-string\">'index'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The query returns the name of the index, the name of the table with which the index is associated, and the SQL statement that defines the index.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SQLite DROP INDEX statement examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>DROP INDEX<\/code> statement.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1) Removing indexes<\/h3>\n\n\n\n<p>First, <a href=\"https:\/\/www.sqlitetutorial.net\/sqlite-create-table\/\">create a new table<\/a> called <code>customers<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> customers(\n    <span class=\"hljs-keyword\">id<\/span> <span class=\"hljs-built_in\">INTEGER<\/span> PRIMARY <span class=\"hljs-keyword\">KEY<\/span>,\n    <span class=\"hljs-keyword\">name<\/span> <span class=\"hljs-built_in\">TEXT<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-literal\">NULL<\/span>,\n    email <span class=\"hljs-built_in\">TEXT<\/span> <span class=\"hljs-keyword\">UNIQUE<\/span>    \n);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, create an index on the <code>name<\/code> column:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_name \n<span class=\"hljs-keyword\">ON<\/span> customers(<span class=\"hljs-keyword\">name<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Third, create a unique index on the <code>email<\/code> column:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">UNIQUE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_email\n<span class=\"hljs-keyword\">ON<\/span> customers(email);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Fourth, retrieve all indexes of the current database:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n   <span class=\"hljs-keyword\">name<\/span>, \n   tbl_name, \n   <span class=\"hljs-keyword\">sql<\/span>\n<span class=\"hljs-keyword\">FROM<\/span>\n   sqlite_master\n<span class=\"hljs-keyword\">WHERE<\/span>\n   <span class=\"hljs-keyword\">type<\/span>= <span class=\"hljs-string\">'index'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">name                          tbl_name   sql\n<span class=\"hljs-comment\">----------------------------  ---------  ----------------------------------<\/span>\nsqlite_autoindex_customers_1  customers  null\n\ncustomer_name                 customers  <span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_name\n                                         <span class=\"hljs-keyword\">ON<\/span> customers(<span class=\"hljs-keyword\">name<\/span>)\n\ncustomer_email                customers  <span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">UNIQUE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_email\n                                         <span class=\"hljs-keyword\">ON<\/span> customers(email)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The output indicates that there are three indexes. One is created automatically when defining the table and two others are created using the <code>CREATE INDEX<\/code> statement.<\/p>\n\n\n\n<p>Fifth, remove the <code>customer_name<\/code> index using the <code>DROP INDEX<\/code> statement:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_name;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Verify the index removal:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span>\n   <span class=\"hljs-keyword\">name<\/span>, \n   tbl_name, \n   <span class=\"hljs-keyword\">sql<\/span>\n<span class=\"hljs-keyword\">FROM<\/span>\n   sqlite_master\n<span class=\"hljs-keyword\">WHERE<\/span>\n   <span class=\"hljs-keyword\">type<\/span>= <span class=\"hljs-string\">'index'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">name                          tbl_name   sql\n<span class=\"hljs-comment\">----------------------------  ---------  ----------------------------------<\/span>\nsqlite_autoindex_customers_1  customers  null\n\ncustomer_email                customers  <span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">UNIQUE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_email\n                                         <span class=\"hljs-keyword\">ON<\/span> customers(email)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The output indicates that the <code>customer_name<\/code> index has been removed successfully.<\/p>\n\n\n\n<p>Finally, remove the <code>customer_email<\/code> index:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_email;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h3 class=\"wp-block-heading\">2) Dropping an index that does not exist<\/h3>\n\n\n\n<p>The following statement uses the <code>DROP<\/code> <code>INDEX<\/code> statement to drop an index that does not exist:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">INDEX<\/span> customer_phone;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>It returns the following error:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\">Parse error: no such index: customer_phone<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>To conditionally remove an index only if it exists, you can use the <code>IF EXISTS<\/code> option:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">INDEX<\/span> <span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">EXISTS<\/span> customer_phone;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>This time, SQLite does not issue any errors.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Summary<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Use the <code>DROP INDEX<\/code> to remove an index from an SQLite database.<\/li>\n\n\n\n<li>Use the <code>IF EXISTS<\/code> option to conditionally drop an index if it exists.<\/li>\n<\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful ?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"3365\"\n\t\t\t\tdata-post-url=\"https:\/\/www.sqlitetutorial.net\/sqlite-index\/sqlite-drop-index\/\"\n\t\t\t\tdata-post-title=\"SQLite DROP INDEX 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