PHP Query Help Please - Unknown Column

[sportypants]

Hello,

Please can someone try and help me with the following query I have to get working for a college assignment:

$query = "SELECT *, sqrt(pow(tblcalc.sum1, 2) + pow(tblcalc.sum2, 2)) / 4 as SUMTOTAL FROM tblsums WHERE SUMTOTAL < $VAR ORDER BY $orderby $sort ";

I have named the sum 'SUMTOTAL' which works fine my problem is when I try to show only 'SUMTOTAL' which is < $VAR the query produces an error "Unknown Column 'SUMTOTAL' in where clause'

I would be very grateful for any advice or help anyone can offer me.

Thank you kindly,

JJ

[sportypants]

Got it working thank you. Replaced Where with Having and worked fine.