Referring to a Column Alias in a WHERE Clause

Question

SELECT logcount, logUserID, maxlogtm
   , DATEDIFF(day, maxlogtm, GETDATE()) AS daysdiff
FROM statslogsummary
WHERE daysdiff > 120

I get

Answer 1

HAVING works in MySQL according to documentation:

The HAVING clause was added to SQL because the WHERE keyword could not be used with aggregate functions.