Question

I have a mySql table … quite simple (id, firstColumn, secondColumn)
I want to make a query who display me the duplicate values in secondColumn with the same value in firstColumn

If i have something like that

1, 14, 1
2, 14, 2
3, 15, 1
4, 15, 2
5, 14, 2
6, 15, 1
7, 16, 1
8, 17, 1

my query to display duplicate values

5, 14, 2
6, 15, 1

Thanks

Answer 1

Try this:

SELECT column1, column2, COUNT(*)
FROM tableNAME
GROUP BY column1, column2
HAVING COUNT(*) > 1