{"id":1805,"date":"2025-02-02T08:38:55","date_gmt":"2025-02-02T01:38:55","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1805"},"modified":"2025-02-02T08:56:11","modified_gmt":"2025-02-02T01:56:11","slug":"postgresql-position","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-position\/","title":{"rendered":"PostgreSQL POSITION Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn to use the PostgreSQL <code>POSITION<\/code> function to find the location of the first occurrence of a substring within a string.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-postgresql-position-function'>Introduction to the PostgreSQL POSITION function <a href=\"#introduction-to-the-postgresql-position-function\" class=\"anchor\" id=\"introduction-to-the-postgresql-position-function\" title=\"Anchor for Introduction to the PostgreSQL POSITION function\">#<\/a><\/h2>\n\n\n\n<p>The <code>POSITION<\/code> function allows you to find the location of the first occurrence of a substring within a string.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>POSITION<\/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\">POSITION(substring <span class=\"hljs-keyword\">IN<\/span> string)<\/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>POSITION<\/code> function takes two parameters:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>substring<\/code>: The substring you want to search for.<\/li>\n\n\n\n<li><code>string<\/code>: The source string in which you want to search.<\/li>\n<\/ul>\n\n\n\n<p>The <code>POSITION<\/code> function returns an integer representing the starting position (1-indexed) of the first occurrence of the substring in the string.<\/p>\n\n\n\n<p>If the substring does not exist in the string, the <code>POSITION<\/code> function returns 0. If the substring or string is <code>NULL<\/code>, the <code>POSITION<\/code> function returns <code>NULL<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='basic-postgresql-position-function-example'>Basic PostgreSQL POSITION function example <a href=\"#basic-postgresql-position-function-example\" class=\"anchor\" id=\"basic-postgresql-position-function-example\" title=\"Anchor for Basic PostgreSQL POSITION function example\">#<\/a><\/h2>\n\n\n\n<p>The following example uses the <code>POSITION<\/code> function to return the location of the first instance of the substring <code>\"t\"<\/code> in the string <code>\"pgtutorial.com\"<\/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  POSITION(<span class=\"hljs-string\">'t'<\/span> <span class=\"hljs-keyword\">IN<\/span> <span class=\"hljs-string\">'pgtutorial.com'<\/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=U0VMRUNUIFBPU0lUSU9OKCAnUG9zdGdyZVNRTCcgSU4gJ1Bvc3RncmVTUUwgd2lsbCwgUG9zdGdyZVNRTCB3aWxsIHJvY2sgeW91IScgKSByZXN1bHQ7\" 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\">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>The following example returns zero because the substring <code>\"JS\"<\/code> does not exist in the string <code>\"PostgreSQL\"<\/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  POSITION(<span class=\"hljs-string\">'JS'<\/span> <span class=\"hljs-keyword\">IN<\/span> <span class=\"hljs-string\">'PostgreSQL'<\/span>) result;<\/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=U0VMRUNUIFBPU0lUSU9OKCdXZScgSU4gJ1NRTCB3aWxsLCBTUUwgd2lsbCByb2NrIHlvdSEnKSByZXN1bHQ7\" 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\"> result\n<span class=\"hljs-comment\">--------<\/span>\n      <span class=\"hljs-number\">0<\/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 statement returns <code>NULL<\/code> because the substring is <code>NULL<\/code>:<\/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  POSITION(<span class=\"hljs-keyword\">NULL<\/span> <span class=\"hljs-keyword\">IN<\/span> <span class=\"hljs-string\">'PostgreSQL Tutorial'<\/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=U0VMRUNUIFBPU0lUSU9OKE5VTEwgSU4gJ1Bvc3RncmVTUUwgVHV0b3JpYWwnKSByZXN1bHQ7\" 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   <span class=\"hljs-keyword\">NULL<\/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<h2 class=\"wp-block-heading\" id='using-the-postgresql-position-function-with-table-data'>Using the PostgreSQL POSITION function with table data <a href=\"#using-the-postgresql-position-function-with-table-data\" class=\"anchor\" id=\"using-the-postgresql-position-function-with-table-data\" title=\"Anchor for Using the PostgreSQL POSITION function with table data\">#<\/a><\/h2>\n\n\n\n<p>We&#8217;ll use the <code>users<\/code> table from the inventory sample database for the demonstration:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"144\" height=\"116\" src=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/users.png\" alt=\"\" class=\"wp-image-1056\"\/><\/figure>\n\n\n\n<p>The following example uses the <code>POSITION<\/code> function to find the location of the <code>@<\/code> symbol in email addresses:<\/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  email,\n  POSITION(<span class=\"hljs-string\">'@'<\/span> <span class=\"hljs-keyword\">IN<\/span> email) <span class=\"hljs-keyword\">AS<\/span> at_sign_position\n<span class=\"hljs-keyword\">FROM<\/span>\n  users\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  email;<\/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=U0VMRUNUIGVtYWlsLCBQT1NJVElPTignQCcgSU4gZW1haWwpIEFTIGF0X3NpZ25fcG9zaXRpb24gRlJPTSB1c2VycyBPUkRFUiBCWSBlbWFpbDs%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-9\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">            email             | at_sign_position\n<span class=\"hljs-comment\">------------------------------+------------------<\/span>\n alice.jones@pgtutorial.com   |               <span class=\"hljs-number\">12<\/span>\n bob.brown@pgtutorial.com     |               <span class=\"hljs-number\">10<\/span>\n charlie.davis@pgtutorial.com |               <span class=\"hljs-number\">14<\/span>\n jane.smith@pgtutorial.com    |               <span class=\"hljs-number\">11<\/span>\n john.doe@pgtutorial.com      |                <span class=\"hljs-number\">9<\/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>To extract usernames from emails, you can use the <code>POSITION<\/code> function with the <code>LEFT<\/code> function:<\/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>\n  email,\n  LEFT(email, POSITION(<span class=\"hljs-string\">'@'<\/span> <span class=\"hljs-keyword\">IN<\/span> email) <span class=\"hljs-number\">-1<\/span>) <span class=\"hljs-keyword\">AS<\/span> username\n<span class=\"hljs-keyword\">FROM<\/span>\n  users\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n  email;<\/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=U0VMRUNUIGVtYWlsLCBMRUZUKGVtYWlsLCBQT1NJVElPTignQCcgSU4gZW1haWwpIC0xKSBBUyB1c2VybmFtZSBGUk9NIHVzZXJzIE9SREVSIEJZIGVtYWlsOw%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-11\" data-shcb-language-name=\"PostgreSQL SQL dialect and PL\/pgSQL\" data-shcb-language-slug=\"pgsql\"><span><code class=\"hljs language-pgsql\">            email             |   username\n<span class=\"hljs-comment\">------------------------------+---------------<\/span>\n alice.jones@pgtutorial.com   | alice.jones\n bob.brown@pgtutorial.com     | bob.brown\n charlie.davis@pgtutorial.com | charlie.davis\n jane.smith@pgtutorial.com    | jane.smith\n john.doe@pgtutorial.com      | john.doe<\/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>How these functions work:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>First, the <code>POSITION<\/code> function returns the location of the <code>@<\/code> in the email address.<\/li>\n\n\n\n<li>Second, the <code>LEFT<\/code> function extracts the username from position 1 to the position of the <code>@<\/code> sign minus 1.<\/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>POSITION<\/code> function to return the location of the first occurrence of a substring within 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=\"1805\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-string-functions\/postgresql-position\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL POSITION 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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substring within a string.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1800,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1805","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 POSITION Function<\/title>\n<meta name=\"description\" content=\"You&#039;ll learn to use the PostgreSQL POSITION function to find the location of the first occurrence of a substring within 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-position\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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