Select where count of one field is greater than one

Question

I want to do something like this:

SELECT *    FROM db.table   WHERE COUNT(someField) > 1 

How can I achieve this in MySql?

Answer 1

Use the HAVING, not WHERE clause, for aggregate result comparison.

Taking the query at face value:

SELECT *    FROM db.table  HAVING COUNT(someField) > 1 

Ideally, there should be a GROUP BY defined for proper valuation in the HAVING clause, but MySQL does allow hidden columns from the GROUP BY...

Is this in preparation for a unique constraint on someField? Looks like it should be...