database queries Archives - Belchamber Web Tools, AI Guidance & Code https://tools.belchamber.us/tag/database-queries/ Aaron Belchamber: AI-Centric Senior Cloud Software Engineer - Jacksonville FL Tue, 17 Mar 2015 00:59:33 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 99928718 MySQL: Using sub-selects to filter results of one table that is not contained in another table https://tools.belchamber.us/mysql-using-sub-selects-to-filter-results-of-one-table-that-is-not-contained-in-another-table/ https://tools.belchamber.us/mysql-using-sub-selects-to-filter-results-of-one-table-that-is-not-contained-in-another-table/#respond Tue, 17 Mar 2015 00:57:20 +0000 http://tools.belchamber.us/?p=735 In MySQL, if you have two tables with a shared index and you would like to show the results of one table where the index is not within another table, you can use “NOT IN”. SELECT * FROM table2 WHERE some_field not in (SELECT some_field FROM table1) Try Googling “MySQL NOT IN” and you get […]

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