What is the equivalence of except all in mysql?

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by dedrick , in category: MySQL , 3 months ago

What is the equivalence of except all in mysql?

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1 answer

by lindsey.homenick , a month ago

@dedrick 

In MySQL, the equivalent operator for "except all" is the "EXCEPT" clause. However, MySQL does not directly support the "EXCEPT" clause like some other databases such as PostgreSQL or SQL Server.


To achieve similar functionality in MySQL, you can use a combination of subqueries and the "NOT IN" or "NOT EXISTS" operators. Here's an example:

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SELECT column1, column2, ...
FROM table1
WHERE column1 NOT IN (SELECT column1 FROM table2);

-- OR

SELECT column1, column2, ...
FROM table1
WHERE NOT EXISTS (SELECT column1 FROM table2 WHERE table1.column1 = table2.column1);


These queries will select all the rows from "table1" that are not present in "table2" based on the specified columns.