MySQL WHERE: how to write “!=” or “not equals”?

Question

I need to do this

DELETE FROM konta WHERE taken != \'\'

But != doesn\'t exist in mysql. Anyone know how to do this?

Answer 1

The != operator most certainly does exist! It is an alias for the standard <> operator.

Perhaps your fields are not actually empty strings, but instead NULL?

To compare to NULL you can use IS NULL or IS NOT NULL or the null safe equals operator <=>.