{"id":1113,"date":"2024-12-20T13:40:34","date_gmt":"2024-12-20T06:40:34","guid":{"rendered":"https:\/\/www.pgtutorial.com\/?page_id=1113"},"modified":"2025-01-05T20:24:50","modified_gmt":"2025-01-05T13:24:50","slug":"postgresql-ntile","status":"publish","type":"page","link":"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-ntile\/","title":{"rendered":"PostgreSQL NTILE Window Function"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the PostgreSQL <code>NTILE()<\/code> function to assign a tile number to each row within a partition in a result set.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='getting-started-with-the-postgresql-ntile-window-function'>Getting Started with the PostgreSQL NTILE() Window Function <a href=\"#getting-started-with-the-postgresql-ntile-window-function\" class=\"anchor\" id=\"getting-started-with-the-postgresql-ntile-window-function\" title=\"Anchor for Getting Started with the PostgreSQL NTILE() Window Function\">#<\/a><\/h2>\n\n\n\n<p>The <code>NTILE()<\/code> function divides the rows of a result set into roughly equal-sized groups or tiles. It assigns each row a tile number based on the distribution. <\/p>\n\n\n\n<p>The <code>NTILE()<\/code> function can be helpful for data segmentation and percentile calculations.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='syntax'>Syntax <a href=\"#syntax\" class=\"anchor\" id=\"syntax\" title=\"Anchor for Syntax\">#<\/a><\/h3>\n\n\n\n<p>Here&#8217;s the syntax for the <code>NTILE()<\/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\">NTILE(num_tiles) <span class=\"hljs-keyword\">OVER<\/span> (\n    &#91;<span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> partition_expression]\n    &#91;<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> sort_expression]\n)<\/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><strong>In this syntax:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>num_tiles<\/code><strong>:<\/strong> The number of tiles or groups you want to divide the result set into.<\/li>\n\n\n\n<li><code>PARTITION BY<\/code><strong>:<\/strong> This optional clause divides the result set into partitions. If you omit the clause, the <code>PARTITION BY<\/code> treats the whole result set as a single partition.<\/li>\n\n\n\n<li><code>ORDER BY<\/code><strong>:<\/strong> This specifies the columns by which you want to sort the rows within each partition.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='postgresql-ntile-window-function-examples'>PostgreSQL NTILE Window Function Examples <a href=\"#postgresql-ntile-window-function-examples\" class=\"anchor\" id=\"postgresql-ntile-window-function-examples\" title=\"Anchor for PostgreSQL NTILE Window Function Examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s explore examples of using the <code>NTILE()<\/code> function with the <code>products<\/code> table, which contains information about products, to understand how it works.<\/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=\"row_number function with products table\" class=\"wp-image-1051\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id='basic-ntile-window-function-example'>Basic NTILE Window Function Example <a href=\"#basic-ntile-window-function-example\" class=\"anchor\" id=\"basic-ntile-window-function-example\" title=\"Anchor for Basic NTILE Window Function Example\">#<\/a><\/h3>\n\n\n\n<p>The following <code><a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-select\/\">SELECT<\/a><\/code> statement uses the <code>NTILE()<\/code> function to divide the products into three roughly equal-sized groups based on their safety stock, which is a measure of the minimum quantity of a product that should be kept in stock to ensure a continuous supply:<\/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  product_name,\n  safety_stock,\n  NTILE(<span class=\"hljs-number\">3<\/span>) <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      safety_stock\n  ) <span class=\"hljs-keyword\">AS<\/span> safety_stock_tile\n<span class=\"hljs-keyword\">FROM<\/span>\n  products\n<span class=\"hljs-keyword\">WHERE<\/span>\n  safety_stock &gt; <span class=\"hljs-number\">0<\/span>;<\/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=U0VMRUNUIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBOVElMRSgzKSBPVkVSICggT1JERVIgQlkgc2FmZXR5X3N0b2NrICkgQVMgc2FmZXR5X3N0b2NrX3RpbGUgRlJPTSBwcm9kdWN0cyBXSEVSRSBzYWZldHlfc3RvY2sgPiAwOw%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\">       product_name        | safety_stock | safety_stock_tile\n<span class=\"hljs-comment\">---------------------------+--------------+-------------------<\/span>\n Samsung Galaxy S24        |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Sony Xperia <span class=\"hljs-number\">1<\/span> VI          |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n LG G3 OLED                |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>       |           <span class=\"hljs-number\">15<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Samsung Galaxy Watch <span class=\"hljs-number\">6<\/span>    |           <span class=\"hljs-number\">15<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Samsung Galaxy Z Fold <span class=\"hljs-number\">5<\/span>   |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Apple Watch Series <span class=\"hljs-number\">9<\/span>      |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span>           |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n LG OLED TV C3             |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Huawei Mate <span class=\"hljs-number\">60<\/span>            |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span> |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Sony Bravia XR A95K       |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Samsung QN900C Neo QLED   |           <span class=\"hljs-number\">40<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Apple AirPods Pro <span class=\"hljs-number\">3<\/span>       |           <span class=\"hljs-number\">45<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max   |           <span class=\"hljs-number\">50<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Samsung Galaxy Tab S9     |           <span class=\"hljs-number\">60<\/span> |                 <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>In this output, the <code>safety_stock_tile<\/code> column contains the tile number assigned to each product based on its safety stock.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='using-partition-by-clause'>Using PARTITION BY Clause <a href=\"#using-partition-by-clause\" class=\"anchor\" id=\"using-partition-by-clause\" title=\"Anchor for Using PARTITION BY Clause\">#<\/a><\/h3>\n\n\n\n<p>The following statement uses the <code>NTILE()<\/code> function to divide the result set into partitions for each category and then apply the <code>NTILE()<\/code> function within each.<\/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  category_id,\n  product_name,\n  safety_stock,\n  NTILE(<span class=\"hljs-number\">3<\/span>) <span class=\"hljs-keyword\">OVER<\/span> (\n    <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      category_id\n    <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span>\n      safety_stock\n  ) <span class=\"hljs-keyword\">AS<\/span> safety_stock_tile\n<span class=\"hljs-keyword\">FROM<\/span>\n  products\n<span class=\"hljs-keyword\">WHERE<\/span>\n  safety_stock &gt; <span class=\"hljs-number\">0<\/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=U0VMRUNUIGNhdGVnb3J5X2lkLCBwcm9kdWN0X25hbWUsIHNhZmV0eV9zdG9jaywgTlRJTEUoMykgT1ZFUiAoIFBBUlRJVElPTiBCWSBjYXRlZ29yeV9pZCBPUkRFUiBCWSBzYWZldHlfc3RvY2sgKSBBUyBzYWZldHlfc3RvY2tfdGlsZSBGUk9NIHByb2R1Y3RzIFdIRVJFIHNhZmV0eV9zdG9jayA%2BIDA7\" 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\"> category_id |       product_name        | safety_stock | safety_stock_tile\n<span class=\"hljs-comment\">-------------+---------------------------+--------------+-------------------<\/span>\n           <span class=\"hljs-number\">3<\/span> | Samsung Galaxy S24        |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">3<\/span> | Sony Xperia <span class=\"hljs-number\">1<\/span> VI          |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">3<\/span> | Samsung Galaxy Z Fold <span class=\"hljs-number\">5<\/span>   |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n           <span class=\"hljs-number\">3<\/span> | Apple iPhone <span class=\"hljs-number\">15<\/span>           |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n           <span class=\"hljs-number\">3<\/span> | Huawei Mate <span class=\"hljs-number\">60<\/span>            |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">3<\/span>\n           <span class=\"hljs-number\">3<\/span> | Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max   |           <span class=\"hljs-number\">50<\/span> |                 <span class=\"hljs-number\">3<\/span>\n           <span class=\"hljs-number\">4<\/span> | Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>       |           <span class=\"hljs-number\">15<\/span> |                 <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">4<\/span> | Samsung Galaxy Tab S9     |           <span class=\"hljs-number\">60<\/span> |                 <span class=\"hljs-number\">2<\/span>\n           <span class=\"hljs-number\">5<\/span> | Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span> |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">5<\/span> | Apple AirPods Pro <span class=\"hljs-number\">3<\/span>       |           <span class=\"hljs-number\">45<\/span> |                 <span class=\"hljs-number\">2<\/span>\n           <span class=\"hljs-number\">6<\/span> | Samsung Galaxy Watch <span class=\"hljs-number\">6<\/span>    |           <span class=\"hljs-number\">15<\/span> |                 <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">6<\/span> | Apple Watch Series <span class=\"hljs-number\">9<\/span>      |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n           <span class=\"hljs-number\">8<\/span> | LG G3 OLED                |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">8<\/span> | LG OLED TV C3             |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">1<\/span>\n           <span class=\"hljs-number\">8<\/span> | Sony Bravia XR A95K       |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">2<\/span>\n           <span class=\"hljs-number\">8<\/span> | Samsung QN900C Neo QLED   |           <span class=\"hljs-number\">40<\/span> |                 <span class=\"hljs-number\">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>In this output, the <code>safety_stock_tile<\/code> column contains the tile number assigned to each product&#8217;s safety stock within each category.<\/p>\n\n\n\n<p>You can retrieve the category name from the categories table by <a href=\"https:\/\/www.pgtutorial.com\/postgresql-tutorial\/postgresql-inner-join\/\">joining<\/a> the <code>products<\/code> table with the <code>categories<\/code> table:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"415\" height=\"254\" src=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-categories-1.png\" alt=\"\" class=\"wp-image-1049\" srcset=\"https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-categories-1.png 415w, https:\/\/www.pgtutorial.com\/wp-content\/uploads\/2024\/12\/products-categories-1-300x184.png 300w\" sizes=\"auto, (max-width: 415px) 100vw, 415px\" \/><\/figure>\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    category_name,\n    product_name, \n    safety_stock, \n    NTILE(<span class=\"hljs-number\">3<\/span>) <span class=\"hljs-keyword\">OVER<\/span> (\n          <span class=\"hljs-keyword\">PARTITION<\/span> <span class=\"hljs-keyword\">BY<\/span> category_name\n          <span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> safety_stock\n    ) <span class=\"hljs-keyword\">AS<\/span> safety_stock_tile\n<span class=\"hljs-keyword\">FROM<\/span> \n    products\n<span class=\"hljs-keyword\">JOIN<\/span> categories <span class=\"hljs-keyword\">USING<\/span> (category_id)\n<span class=\"hljs-keyword\">WHERE<\/span>\n   safety_stock &gt; <span class=\"hljs-number\">0<\/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=U0VMRUNUIGNhdGVnb3J5X25hbWUsIHByb2R1Y3RfbmFtZSwgc2FmZXR5X3N0b2NrLCBOVElMRSgzKSBPVkVSICggUEFSVElUSU9OIEJZIGNhdGVnb3J5X25hbWUgT1JERVIgQlkgc2FmZXR5X3N0b2NrICkgQVMgc2FmZXR5X3N0b2NrX3RpbGUgRlJPTSBwcm9kdWN0cyBKT0lOIGNhdGVnb3JpZXMgVVNJTkcgKGNhdGVnb3J5X2lkKSBXSEVSRSBzYWZldHlfc3RvY2sgPiAwOw%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\"> category_name |       product_name        | safety_stock | safety_stock_tile\n<span class=\"hljs-comment\">---------------+---------------------------+--------------+-------------------<\/span>\n Accessories   | Samsung Galaxy Buds Pro <span class=\"hljs-number\">2<\/span> |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Accessories   | Apple AirPods Pro <span class=\"hljs-number\">3<\/span>       |           <span class=\"hljs-number\">45<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Smartphones   | Samsung Galaxy S24        |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Smartphones   | Sony Xperia <span class=\"hljs-number\">1<\/span> VI          |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Smartphones   | Samsung Galaxy Z Fold <span class=\"hljs-number\">5<\/span>   |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Smartphones   | Apple iPhone <span class=\"hljs-number\">15<\/span>           |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Smartphones   | Huawei Mate <span class=\"hljs-number\">60<\/span>            |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Smartphones   | Apple iPhone <span class=\"hljs-number\">15<\/span> Pro Max   |           <span class=\"hljs-number\">50<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Tablets       | Apple iPad Pro <span class=\"hljs-number\">12.9<\/span>       |           <span class=\"hljs-number\">15<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Tablets       | Samsung Galaxy Tab S9     |           <span class=\"hljs-number\">60<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Televisions   | LG G3 OLED                |           <span class=\"hljs-number\">10<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Televisions   | LG OLED TV C3             |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Televisions   | Sony Bravia XR A95K       |           <span class=\"hljs-number\">30<\/span> |                 <span class=\"hljs-number\">2<\/span>\n Televisions   | Samsung QN900C Neo QLED   |           <span class=\"hljs-number\">40<\/span> |                 <span class=\"hljs-number\">3<\/span>\n Wearables     | Samsung Galaxy Watch <span class=\"hljs-number\">6<\/span>    |           <span class=\"hljs-number\">15<\/span> |                 <span class=\"hljs-number\">1<\/span>\n Wearables     | Apple Watch Series <span class=\"hljs-number\">9<\/span>      |           <span class=\"hljs-number\">20<\/span> |                 <span class=\"hljs-number\">2<\/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='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>NTILE()<\/code> function to divide a result set into quantiles, quartiles, or equal-sized groups.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='quiz'>Quiz <a href=\"#quiz\" class=\"anchor\" id=\"quiz\" title=\"Anchor for Quiz\">#<\/a><\/h2>\n\n\n\n<iframe loading=\"lazy\"\n  name=\"quiz\"\n  src=\"\/quiz\/?quiz=ntile\"\n  height=\"700\"\n  width=\"600\"\n  class=\"iframe\"\n><\/iframe>\n\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=\"1113\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pgtutorial.com\/postgresql-window-functions\/postgresql-ntile\/\"\n\t\t\t\tdata-post-title=\"PostgreSQL NTILE Window 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 feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> Yes 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Getting Started with the PostgreSQL NTILE() Window Function # The NTILE() function divides the rows of a result set into roughly equal-sized groups or tiles. It assigns [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1072,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1113","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 NTILE Window Function<\/title>\n<meta name=\"description\" content=\"You will learn how to use the PostgreSQL NTILE() window function to assign a tile number to each row within a partition in a result set.\" \/>\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-window-functions\/postgresql-ntile\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" 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