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Tip: Understanding UNION in MySQL

Learn how to identify unique records in MySQL.


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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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Sridhar M S. is a Java developer from Bangalore, India. He holds a master's degree in Computer Science.
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