MySQL HAVING

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The HAVING Clause enables you to specify conditions that filter which group results appear in the results.


SELECT column_name(s)
FROM table_name
WHERE condition 
GROUP BY column_name(s)
HAVING condition
ORDER BY column_name(s);

Let's put these statements into real use.

We've a table named Students in our database that contains the following records:

The following MySQL statement lists the number of Students in each Subject. Only include Subjects with more than 2 Students:


SELECT COUNT(ROLL_No), SUBJECT
FROM Students
GROUP BY SUBJECT
HAVING COUNT(ROLL_No) > 1;

Now, after executing the above MySQL statement,

COUNT(ROLL_No)	SUBJECT
2	JAVA

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MySQL - HAVING