Question

I’m having trouble finding out the proper syntax for selecting from a table all entries that have a multiple occurrence, and was hoping somebody would be able to point me in the right direction.

This IS homework, so please answer it in a way that abides by the rules and doesn’t make me a cheater. Thank you!

Answer 1

You can GROUP BY whatever defines a row having multiple occurrence, then select only those HAVING COUNT(*) > 1 like this:

SELECT col1, col2
FROM theTable
GROUP BY col1, col2
HAVING COUNT(*) > 1