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In this tutorial, we will learn how to select all records from one table that do not exist in another table. Both tables have a department ID, and we will display records that do not match. Using the SELECT statement with the EXCEPT keyword, we can achieve this. By comparing department IDs in both tables, we can filter out records that do not match and display only those that match.执行了两个查询后,您可以看到两个部门ID匹配的情况。