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Sum in a query

Posted on 2014-01-27
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Last Modified: 2014-01-28
I am having trouble running a sum in a query for one particular column. The "count" works fine, it just won't sum. I'm guessing it isn't reading it as a number properly, correct?

How can I fix the problem? It comes from a query that runs an expression that is:

BookedTrue: Abs(Sum([Booked]=True And [RecordedMessage]=[qryWhosComputer]![Last]))

It is that value that isn't properly allowing me to sum. Thanks!
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Question by:cansevin
4 Comments
 
LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 39813167
can you please explain what you want to "sum" ?

SUM( <expression> ) is only for the expression returning numbers.
your expression is a boolean expression which will return only true or false.

please clarify
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LVL 75

Accepted Solution

by:
DatabaseMX (Joe Anderson - Microsoft MVP, Access and Data Platform) earned 500 total points
ID: 39813211
Seems you would want:


BookedTrue: Abs(Sum([Booked))

and a WHERE clause of

WHERE  [RecordedMessage]=[qryWhosComputer]![Last]

mx
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LVL 31

Expert Comment

by:Helen_Feddema
ID: 39813215
Generally speaking, with Boolean fields, what you need is a count of the True values (or maybe of the False values, depending on your needs).
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LVL 30

Expert Comment

by:hnasr
ID: 39813842
In this case sum works as count, because it sums abs(-1)s or 0s.
The expression returns a Boolean value, -1 or 0.
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