{"id":10783,"date":"2024-03-14T12:47:59","date_gmt":"2024-03-14T12:47:59","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-does-sql-calculate-the-number-of-duplicate-occurrences\/"},"modified":"2025-08-04T03:53:52","modified_gmt":"2025-08-04T03:53:52","slug":"how-does-sql-calculate-the-number-of-duplicate-occurrences","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-does-sql-calculate-the-number-of-duplicate-occurrences\/","title":{"rendered":"SQL Count Duplicates: GROUP BY &#038; COUNT"},"content":{"rendered":"<p>In SQL, GROUP BY and COUNT functions can be used to calculate the number of repeated occurrences. Here is an example:<\/p>\n<p>If there is a table called &#8220;orders&#8221; with a column named &#8220;product_id&#8221;, we can use the following SQL query to calculate the frequency of each product appearing.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> product_id, <span class=\"hljs-built_in\">COUNT<\/span>(<span class=\"hljs-operator\">*<\/span>) <span class=\"hljs-keyword\">AS<\/span> count\r\n<span class=\"hljs-keyword\">FROM<\/span> orders\r\n<span class=\"hljs-keyword\">GROUP<\/span> <span class=\"hljs-keyword\">BY<\/span> product_id\r\n<\/code><\/pre>\n<p>The above query groups orders by product ID and calculates the frequency of each product ID. The COUNT function is used to calculate the number of rows in each group, resulting in the occurrences of each product ID.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In SQL, GROUP BY and COUNT functions can be used to calculate the number of repeated occurrences. Here is an example: If there is a table called &#8220;orders&#8221; with a column named &#8220;product_id&#8221;, we can use the following SQL query to calculate the frequency of each product appearing. SELECT product_id, COUNT(*) AS count FROM orders [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[13628,766,871,125,569],"class_list":["post-10783","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-count-duplicates","tag-database-queries","tag-group-by","tag-sql","tag-sql-tutorial"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>SQL Count Duplicates: GROUP BY &amp; COUNT - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to count duplicate records in SQL using GROUP BY and COUNT functions with practical examples.\" \/>\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.silicloud.com\/blog\/how-does-sql-calculate-the-number-of-duplicate-occurrences\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"SQL Count Duplicates: GROUP BY &amp; 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