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Understanding UNION in MySQL

Understanding UNION in MySQL

Assuming there are tables EMP and EMP2, which have the same schema, and there are possible duplicate IDs present in them???the following query will help us identify the unique records:

Schema:

CREATE TABLE EMP (NAME VARCHAR(30), ID INT(5))CREATE TABLE EMP2 (NAME VARCHAR(30), ID INT(5))

Query:

SELECT ID FROM EMP UNION SELECT ID FROM EMP2;

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