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MySQL: Retrieve Unique Values and Counts For Each

Posted by: admin November 30, 2017 Leave a comment

Questions:

Is there a simple way to retrieve a list of all unique values in a column, along with how many times that value appeared?

Example dataset:

A
A
A
B
B
C

… Would return:

A  |  3
B  |  2
C  |  1

Thanks!

Answers:

Use GROUP BY:

select value, count(*) from table group by value

Use HAVING to further reduce the results, e.g. only values that occur more than 3 times:

select value, count(*) from table group by value having count(*) > 3

Questions:
Answers:
SELECT id,COUNT(*) FROM file GROUP BY id