{"id":1860,"date":"2025-02-03T10:57:33","date_gmt":"2025-02-03T03:57:33","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1860"},"modified":"2025-02-20T08:20:32","modified_gmt":"2025-02-20T01:20:32","slug":"postgresql-ltrim","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-ltrim\/","title":{"rendered":"PostgreSQL LTRIM Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn to use the PostgreSQL <code>LTRIM()<\/code> function to remove unwanted characters from the start of a string.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-postgresql-ltrim-function'>Introduction to PostgreSQL LTRIM() function <a href=\"#introduction-to-postgresql-ltrim-function\" class=\"anchor\" id=\"introduction-to-postgresql-ltrim-function\" title=\"Anchor for Introduction to PostgreSQL LTRIM() function\">#<\/a><\/h2>\n\n\n\n<p>The <code>LTRIM()<\/code> function removes specified characters from the start of a string.<\/p>\n\n\n\n<p>Here&#8217;s the basic syntax of the <code>LTRIM()<\/code> function:<\/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\">LTRIM(string &#91;, characters])<\/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>The <code>LTRIM()<\/code> function takes two parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>string<\/code> the input string you want to remove characters.<\/li>\n\n\n\n<li><code>characters<\/code> is the characters you want to remove from the start of the input string.<\/li>\n<\/ul>\n\n\n\n<p>The <code>LTRIM()<\/code> function returns a new string with the <code>characters<\/code> removed from the start of the input string.<\/p>\n\n\n\n<p>It returns <code>NULL<\/code> if the string and\/or characters is <code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='basic-postgresql-ltrim-function-examples'>Basic PostgreSQL LTRIM function examples <a href=\"#basic-postgresql-ltrim-function-examples\" class=\"anchor\" id=\"basic-postgresql-ltrim-function-examples\" title=\"Anchor for Basic PostgreSQL LTRIM function examples\">#<\/a><\/h2>\n\n\n\n<p>The following query uses the <code>LTRIM()<\/code> function to remove the dollar sign (<code>$<\/code>) from a string:<\/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\">SELECT<\/span>\n  LTRIM(<span class=\"hljs-string\">'$12.3'<\/span>, <span class=\"hljs-string\">'$'<\/span>) result;<\/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\/?q=U0VMRUNUIExUUklNKCckMTIuMycsICckJykgcmVzdWx0Ow%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\" 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\"> result\n<span class=\"hljs-comment\">--------<\/span>\n <span class=\"hljs-number\">12.3<\/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>To remove the dollar sign (<code>$<\/code>) and convert the value to a number, you can combine the <code>LTRIM()<\/code> function with the cast operator (<code>::<\/code>):<\/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\"><span class=\"hljs-keyword\">SELECT<\/span>\n  LTRIM(<span class=\"hljs-string\">'$12.3'<\/span>, <span class=\"hljs-string\">'$'<\/span>)::<span class=\"hljs-type\">DEC<\/span> amount;<\/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><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIExUUklNKCckMTIuMycsICckJyk6OkRFQyBhbW91bnQ7\" 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-5\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> amount\n<span class=\"hljs-comment\">--------<\/span>\n   <span class=\"hljs-number\">12.3<\/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>The following query uses the <code>LTRIM()<\/code> function to remove leading spaces from a string:<\/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\"><span class=\"hljs-keyword\">SELECT<\/span>\n  LTRIM(<span class=\"hljs-string\">' pgtutorial.com'<\/span>, <span class=\"hljs-string\">''<\/span>) result;<\/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><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIExUUklNKCcgcGd0dXRvcmlhbC5jb20nLCAnJykgcmVzdWx0Ow%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\" 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\">     result\n<span class=\"hljs-comment\">-----------------<\/span>\n  pgtutorial.com<\/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>It&#8217;s equivalent to the following statement that does not use a space as the second parameter:<\/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\"><span class=\"hljs-keyword\">SELECT<\/span>\n  LTRIM(<span class=\"hljs-string\">' pgtutorial.com'<\/span>) result;<\/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<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIExUUklNKCcgcGd0dXRvcmlhbC5jb20nKSByZXN1bHQ7\" 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-9\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">     result\n<span class=\"hljs-comment\">----------------<\/span>\n pgtutorial.com<\/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<h2 class=\"wp-block-heading\" id='using-ltrim-with-table-data'>Using LTRIM with table data <a href=\"#using-ltrim-with-table-data\" class=\"anchor\" id=\"using-ltrim-with-table-data\" title=\"Anchor for Using LTRIM with table data\">#<\/a><\/h2>\n\n\n\n<p>First, <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-create-table\/\">create a new table<\/a> called <code>stock_valuations<\/code> to store stock valuations:<\/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\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> <span class=\"hljs-keyword\">IF<\/span> <span class=\"hljs-keyword\">NOT<\/span> <span class=\"hljs-keyword\">EXISTS<\/span> stock_valuations(\n   product_id <span class=\"hljs-type\">INT<\/span> <span class=\"hljs-keyword\">PRIMARY KEY<\/span>,\n   amount <span class=\"hljs-type\">VARCHAR<\/span>\n);<\/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\/?q=Q1JFQVRFIFRBQkxFIElGIE5PVCBFWElTVFMgc3RvY2tfdmFsdWF0aW9ucyAocHJvZHVjdF9pZCBJTlQgUFJJTUFSWSBLRVksIGFtb3VudCBWQVJDSEFSKTs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Next, <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-insert\/\">insert some rows<\/a> into the <code>stock_valuations<\/code> table:<\/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\"><span class=\"hljs-keyword\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span>\n  stock_valuations (product_id, amount)\n<span class=\"hljs-keyword\">VALUES<\/span>\n  (<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-string\">'$999.99'<\/span>),\n  (<span class=\"hljs-number\">2<\/span>, <span class=\"hljs-string\">'$1099.99'<\/span>),\n  (<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-string\">'$899.99'<\/span>)\n<span class=\"hljs-keyword\">RETURNING<\/span>\n  *;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=SU5TRVJUIElOVE8gc3RvY2tfdmFsdWF0aW9ucyAocHJvZHVjdF9pZCwgYW1vdW50KSBWQUxVRVMgKDEsICckOTk5Ljk5JyksICgyLCAnJDEwOTkuOTknKSwgKDMsICckODk5Ljk5JykgUkVUVVJOSU5HICo7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Then, remove the dollar sign<code>$<\/code> from the start of amounts when retrieving data from the <code>stock_valuations<\/code> table:<\/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>\n  product_id,\n  LTRIM(amount, <span class=\"hljs-string\">'$'<\/span>) amount\n<span class=\"hljs-keyword\">FROM<\/span>\n  stock_valuations\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  product_id;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIHByb2R1Y3RfaWQsIExUUklNKGFtb3VudCwgJyQnKSBhbW91bnQgRlJPTSBzdG9ja192YWx1YXRpb25zIE9SREVSIEJZIHByb2R1Y3RfaWQ7\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\"> product_id | amount\n<span class=\"hljs-comment\">------------+---------<\/span>\n          <span class=\"hljs-number\">1<\/span> | <span class=\"hljs-number\">999.99<\/span>\n          <span class=\"hljs-number\">2<\/span> | <span class=\"hljs-number\">1099.99<\/span>\n          <span class=\"hljs-number\">3<\/span> | <span class=\"hljs-number\">899.99<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PostgreSQL SQL dialect and PL\/pgSQL<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">pgsql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Finally, remove the dollar sign <code>$<\/code>, cast the amounts into decimals, and calculate the <a href=\"https:\/\/www.pgtutorial.com\/postgresql-aggregate-functions\/postgresql-sum\/\">sum<\/a>:<\/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>\n  SUM(LTRIM(amount, <span class=\"hljs-string\">'$'<\/span>)::<span class=\"hljs-type\">DEC<\/span>)\n<span class=\"hljs-keyword\">FROM<\/span>\n  stock_valuations;<\/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\/?q=U0VMRUNUIFNVTShMVFJJTShhbW91bnQsICckJyk6OkRFQykgRlJPTSBzdG9ja192YWx1YXRpb25zOw%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\" 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\">   sum\n<span class=\"hljs-comment\">---------<\/span>\n <span class=\"hljs-number\">2999.97<\/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='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 the PostgreSQL <code>LTRIM()<\/code> function to remove unwanted characters from the beginning of a string.<\/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=\"1860\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-ltrim\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL LTRIM 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tutorial, you&#8217;ll learn to use the PostgreSQL LTRIM() function to remove unwanted characters from the start of a string.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1800,"menu_order":10,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1860","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>PostgreSQL LTRIM Function<\/title>\n<meta name=\"description\" content=\"In this tutorial, you&#039;ll learn to use the PostgreSQL LTRIM() function to remove unwanted characters from the start of a string.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-ltrim\/\" \/>\n<meta property=\"og:locale\" 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