{"id":1847,"date":"2025-02-03T09:35:04","date_gmt":"2025-02-03T02:35:04","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1847"},"modified":"2025-02-03T09:35:16","modified_gmt":"2025-02-03T02:35:16","slug":"postgresql-replace","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-replace\/","title":{"rendered":"PostgreSQL REPLACE Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the PostgreSQL <code>REPLACE<\/code> function to clean data in your database.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-postgresql-replace-function'>Introduction to the PostgreSQL REPLACE function <a href=\"#introduction-to-the-postgresql-replace-function\" class=\"anchor\" id=\"introduction-to-the-postgresql-replace-function\" title=\"Anchor for Introduction to the PostgreSQL REPLACE function\">#<\/a><\/h2>\n\n\n\n<p>The <code>REPLACE<\/code> function takes a string and replaces all occurrences of a substring with a new one.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>REPLACE<\/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\">REPLACE(string, substring, new_substring)<\/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>REPLACE<\/code> function takes three parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>string<\/code> is the input string where all replacements will occur.<\/li>\n\n\n\n<li><code>substring<\/code> is the substring in the input string you want to replace.<\/li>\n\n\n\n<li><code>new_substring<\/code> is the substring that will replace the substring.<\/li>\n<\/ul>\n\n\n\n<p>The <code>REPLACE<\/code> function returns a new string with all occurrences of a substring in the input string replaced by a new one.<\/p>\n\n\n\n<p>The <code>REPLACE()<\/code> function returns <code>NULL<\/code> if any argument is <code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='basic-postgresql-replace-function-example'>Basic PostgreSQL REPLACE function example <a href=\"#basic-postgresql-replace-function-example\" class=\"anchor\" id=\"basic-postgresql-replace-function-example\" title=\"Anchor for Basic PostgreSQL REPLACE function example\">#<\/a><\/h2>\n\n\n\n<p>The following example uses the <code>REPLACE<\/code> function to replace all occurrences of <code>\"We\"<\/code> by <code>\"PostgreSQL\"<\/code> in the string <code>\"We will, We will rock you\"<\/code>:<\/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  REPLACE(<span class=\"hljs-string\">'We will, We will rock you.'<\/span>, <span class=\"hljs-string\">'We'<\/span>, <span class=\"hljs-string\">'PostgreSQL'<\/span>) new_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>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\">                 new_string\n<span class=\"hljs-comment\">--------------------------------------------<\/span>\n PostgreSQL will, PostgreSQL will rock you.<\/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<h2 class=\"wp-block-heading\" id='using-the-postgresql-replace-function-to-transform-data'>Using the PostgreSQL REPLACE function to transform data <a href=\"#using-the-postgresql-replace-function-to-transform-data\" class=\"anchor\" id=\"using-the-postgresql-replace-function-to-transform-data\" title=\"Anchor for Using the PostgreSQL REPLACE function to transform data\">#<\/a><\/h2>\n\n\n\n<p>The following <code>SELECT<\/code> statement uses the <code>REPLACE<\/code> function to retrieve the names of products with the brand id 2 (<code>Apple<\/code>) but with the word <code>\"Apple\"<\/code> replaced by an empty string (<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  product_name,\n  REPLACE(product_name, <span class=\"hljs-string\">'Apple'<\/span>, <span class=\"hljs-string\">''<\/span>) new_product_name\n<span class=\"hljs-keyword\">FROM<\/span>\n  products\n<span class=\"hljs-keyword\">WHERE<\/span>\n  brand_id = <span class=\"hljs-number\">2<\/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><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=U0VMRUNUIHByb2R1Y3RfbmFtZSwgUkVQTEFDRShwcm9kdWN0X25hbWUsICdBcHBsZScsICcnKSBuZXdfcHJvZHVjdF9uYW1lIEZST00gcHJvZHVjdHMgV0hFUkUgYnJhbmRfaWQgPSAyOw%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-5\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">      product_name       |  new_product_name\n<span class=\"hljs-comment\">-------------------------+--------------------<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span>         |  iPhone <span class=\"hljs-number\">15<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max |  iPhone <span class=\"hljs-number\">15<\/span> Pro Max\n Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>     |  iPad Pro <span class=\"hljs-number\">12.9<\/span>\n Apple AirPods Pro <span class=\"hljs-number\">3<\/span>     |  AirPods Pro <span class=\"hljs-number\">3<\/span>\n Apple Watch Series <span class=\"hljs-number\">9<\/span>    |  Watch Series <span class=\"hljs-number\">9<\/span>\n Apple iMac <span class=\"hljs-number\">24<\/span>\"          |  iMac 24\"<\/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>In this example, the <code>REPLACE<\/code> function transforms the product names when retrieving them. It does not modify the data in the <code>products<\/code> table.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='replacing-texts-in-a-table'>Replacing texts in a table <a href=\"#replacing-texts-in-a-table\" class=\"anchor\" id=\"replacing-texts-in-a-table\" title=\"Anchor for Replacing texts in a table\">#<\/a><\/h2>\n\n\n\n<p>The following example uses the <code>REPLACE<\/code> function in the <code>UPDATE<\/code> statement to update the product names:<\/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\">UPDATE<\/span> products\n<span class=\"hljs-keyword\">SET<\/span>\n  product_name = REPLACE(product_name, <span class=\"hljs-string\">'Apple'<\/span>, <span class=\"hljs-string\">''<\/span>)\n<span class=\"hljs-keyword\">WHERE<\/span>\n  brand_id = <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><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=VVBEQVRFIHByb2R1Y3RzIFNFVCBwcm9kdWN0X25hbWUgPSBSRVBMQUNFKHByb2R1Y3RfbmFtZSwgJ0FwcGxlJywgJycpIFdIRVJFIGJyYW5kX2lkID0gMjs%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>This query pattern helps clean up data in the database:<\/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\">UPDATE<\/span> <span class=\"hljs-built_in\">table_name<\/span>\n<span class=\"hljs-keyword\">SET<\/span>\n  <span class=\"hljs-built_in\">column_name<\/span> = REPLACE(<span class=\"hljs-built_in\">column_name<\/span>, <span class=\"hljs-string\">'substring'<\/span>, <span class=\"hljs-string\">'new_substring'<\/span>)\n<span class=\"hljs-keyword\">WHERE<\/span>\n  condition;<\/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<h2 class=\"wp-block-heading\" id='common-mistake-when-using-the-replace-function'>Common mistake when using the REPLACE function <a href=\"#common-mistake-when-using-the-replace-function\" class=\"anchor\" id=\"common-mistake-when-using-the-replace-function\" title=\"Anchor for Common mistake when using the REPLACE function\">#<\/a><\/h2>\n\n\n\n<p>It&#8217;s important to note that the column_name in the <code>REPLACE<\/code> function does not have a single quote (<code>'<\/code>).<\/p>\n\n\n\n<p>If you place the column name inside the quote, you&#8217;ll set all the values in the column_name to the same unexpected value. For example:<\/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\">UPDATE<\/span> products\n<span class=\"hljs-keyword\">SET<\/span>\n  product_name = REPLACE(<span class=\"hljs-string\">'product_name'<\/span>, <span class=\"hljs-string\">'Apple'<\/span>, <span class=\"hljs-string\">''<\/span>)\n<span class=\"hljs-keyword\">WHERE<\/span>\n  brand_id = <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<p><a href=\"https:\/\/www.pgtutorial.com\/playground\/?q=VVBEQVRFIHByb2R1Y3RzIFNFVCBwcm9kdWN0X25hbWUgPSBSRVBMQUNFKCdwcm9kdWN0X25hbWUnLCAnQXBwbGUnLCAnJykgV0hFUkUgYnJhbmRfaWQgPSAyOw%3D%3D\" target=\"_blank\" rel=\"noreferrer noopener\">Try it<\/a><\/p>\n\n\n\n<p>First, the <code>REPLACE<\/code> function will return the following string:<\/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\">product_name<\/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>Second, the <code>UPDATE<\/code> statement will update the product name of the products with the <code>brand_id<\/code> <code>2<\/code> to <code>'product_name'<\/code>.<\/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 the <code>REPLACE<\/code> function to return a new string by replacing all occurrences of a substring with a new one.<\/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=\"1847\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-replace\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL REPLACE 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 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