{"id":1871,"date":"2025-02-03T12:52:59","date_gmt":"2025-02-03T05:52:59","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1871"},"modified":"2025-02-03T15:15:26","modified_gmt":"2025-02-03T08:15:26","slug":"postgresql-lpad","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-lpad\/","title":{"rendered":"PostgreSQL LPAD Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the PostgreSQL <code>LPAD<\/code> function to pad a string with specified characters to a certain length.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-postgresql-lpad-function'>Introduction to the PostgreSQL LPAD function <a href=\"#introduction-to-the-postgresql-lpad-function\" class=\"anchor\" id=\"introduction-to-the-postgresql-lpad-function\" title=\"Anchor for Introduction to the PostgreSQL LPAD function\">#<\/a><\/h2>\n\n\n\n<p>The <code>LPAD()<\/code> function pads a string to a certain length with specified characters.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>LPAD()<\/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\">LPAD (string, target_length &#91;, fill])<\/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>string<\/code>: The input string you want to pad.<\/li>\n\n\n\n<li><code>target_length<\/code>: The length of the result string after padding.<\/li>\n\n\n\n<li><code>fill<\/code>: is a string for padding. It defaults to a space.<\/li>\n<\/ul>\n\n\n\n<p>The <code>LPAD()<\/code> function returns a new string whose length reaches the target length and is padded with the <code>fill<\/code> characters.<\/p>\n\n\n\n<p>If the length of the string is less than the <code>target_length<\/code>, the <code>LPAD()<\/code> function truncates the string to the <code>target_length<\/code>.<\/p>\n\n\n\n<p>If the length of the string is equal to the <code>target_length<\/code>, the <code>LPAD()<\/code> function won&#8217;t pad the string and returns the original string.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='basic-postgresql-lpad-function-examples'>Basic PostgreSQL LPAD function examples <a href=\"#basic-postgresql-lpad-function-examples\" class=\"anchor\" id=\"basic-postgresql-lpad-function-examples\" title=\"Anchor for Basic PostgreSQL LPAD function examples\">#<\/a><\/h2>\n\n\n\n<p>The following statement uses the <code>LPAD()<\/code> function to pad zero on the left of the string <code>789<\/code> to a string of <code>6<\/code> characters:<\/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  LPAD(<span class=\"hljs-string\">'789'<\/span>, <span class=\"hljs-number\">6<\/span>, <span class=\"hljs-string\">'0'<\/span>) numeric_string;<\/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=U0VMRUNUIExQQUQoJzc4OScsIDYsICcwJykgbnVtZXJpY19zdHJpbmc7\" 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\"> numeric_string\n<span class=\"hljs-comment\">----------------<\/span>\n <span class=\"hljs-number\">000789<\/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>The following query uses the <code>LPAD()<\/code> function to truncates string <code>'PostgreSQL Tutorial'<\/code> to the length of 10:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"JavaScript\" data-shcb-language-slug=\"javascript\"><span><code class=\"hljs language-javascript\">SELECT\n  LPAD(<span class=\"hljs-string\">'PostgreSQL Tutorial'<\/span>, <span class=\"hljs-number\">10<\/span>);<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">JavaScript<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">javascript<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIExQQUQoJ1Bvc3RncmVTUUwgVHV0b3JpYWwnLCAxMCk7\" 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=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">    lpad\n------------\n PostgreSQL<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following example doesn&#8217;t pad string because the length of the input string is the same as the target length:<\/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  LPAD(<span class=\"hljs-string\">'PostgreSQL'<\/span>, <span class=\"hljs-number\">10<\/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><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIExQQUQoJ1Bvc3RncmVTUUwnLCAxMCk7\" 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=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\">    lpad\n------------\n PostgreSQL<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<h2 class=\"wp-block-heading\" id='padding-ids-in-the-database'>Padding IDs in the database <a href=\"#padding-ids-in-the-database\" class=\"anchor\" id=\"padding-ids-in-the-database\" title=\"Anchor for Padding IDs in the database\">#<\/a><\/h2>\n\n\n\n<p>We&#8217;ll use the <code>products<\/code> table from the <code>inventory<\/code> database:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"159\" height=\"254\" src=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products.png\" alt=\"PostgreSQL COUNT Window Function\" class=\"wp-image-1051\"\/><\/figure>\n\n\n\n<p>The following query retrieves product id, name from the <code>products<\/code> table and pads the product id with zero <code>'0'<\/code>:<\/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  LPAD(product_id::<span class=\"hljs-type\">TEXT<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-string\">'0'<\/span>) id,\n  product_name\n<span class=\"hljs-keyword\">FROM<\/span>\n  products;<\/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=U0VMRUNUIExQQUQocHJvZHVjdF9pZDo6VEVYVCwgMywgJzAnKSBpZCwgcHJvZHVjdF9uYW1lIEZST00gcHJvZHVjdHM7\" 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=\"plaintext\" data-shcb-language-slug=\"plaintext\"><span><code class=\"hljs language-plaintext\"> id  |        product_name\n-----+----------------------------\n 001 | Samsung Galaxy S24\n 002 | Apple iPhone 15\n 003 | Huawei Mate 60\n 004 | Xiaomi Mi 14\n 005 | Sony Xperia 1 VI\n...<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">plaintext<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">plaintext<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, cast the product id into <code>TEXT<\/code>.<\/li>\n\n\n\n<li>Second, pad the product id with zero (<code>'0'<\/code>) to the length of 3.<\/li>\n<\/ul>\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 the <code>LPAD()<\/code> function to pad specified characters on the left of a string to a certain length.<\/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=\"1871\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-lpad\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL LPAD Function\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather 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