{"id":5727,"date":"2024-03-14T03:17:00","date_gmt":"2024-03-14T03:17:00","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-implement-vertical-merge-of-two-sql-tables\/"},"modified":"2025-08-01T18:55:25","modified_gmt":"2025-08-01T18:55:25","slug":"how-to-implement-vertical-merge-of-two-sql-tables","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-implement-vertical-merge-of-two-sql-tables\/","title":{"rendered":"SQL Vertical Merge: Using UNION ALL"},"content":{"rendered":"<p>In SQL, you can use the UNION ALL statement to vertically merge two tables. The specific syntax is as follows:<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> <span class=\"hljs-operator\">*<\/span> <span class=\"hljs-keyword\">FROM<\/span> table1\r\n<span class=\"hljs-keyword\">UNION<\/span> <span class=\"hljs-keyword\">ALL<\/span>\r\n<span class=\"hljs-keyword\">SELECT<\/span> <span class=\"hljs-operator\">*<\/span> <span class=\"hljs-keyword\">FROM<\/span> table2;\r\n<\/code><\/pre>\n<p>&#8220;Table1 and Table2 are the two tables that need to be merged. By using UNION ALL, all the data from both tables can be merged together without removing duplicates. If you want to remove duplicates, you can use the UNION statement, but it may slightly impact performance.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In SQL, you can use the UNION ALL statement to vertically merge two tables. The specific syntax is as follows: SELECT * FROM table1 UNION ALL SELECT * FROM table2; &#8220;Table1 and Table2 are the two tables that need to be merged. By using UNION ALL, all the data from both tables can be merged [&hellip;]<\/p>\n","protected":false},"author":5,"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":[284,125,1034,6493,5096],"class_list":["post-5727","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-database","tag-sql","tag-sql-query","tag-table-merge","tag-union-all"],"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 Vertical Merge: Using UNION ALL - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to vertically merge SQL tables using UNION ALL. 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