Question

I tried this query below but it still returns days that had -1 values. I want the where clause to return rows that are 2 days or newer. Thanks!

SELECT uniqueKey,(TO_DAYS(TimeStampColumn) - TO_Days(Now())) as 'dayDiff'
 FROM couponextractor.tblresults
 where 'dayDiff' >= 0

Answer 1

Because you just compare string ‘daydiff’ >= 0, which always evaluates to 0 => true

You need to get rid of quotes and use HAVING, beside that’s very inefficient query… it’s better to compute the date before and just use >= operator on the column.

HAVING dayDiff >= 0

So just compute the exact date, and then just do
WHERE TimeStampColumn >= “XXXX-XX-XX AA:AA:AA” so it can be optimized by the server if you have indexes.