Access Data Type Conversion to Boolean
I am performing a query on the following table:
Approval
- person (long int)
- item (long int)
- reason (long int)
- date (date)
- valid (bool)
The first 3 fields are linked to other tables. Each person may have any number of entries in this table, for various items, reasons or dates. I then perform the following query:
SELECT Approval.person,
Approval.item,
Approval.reason,
Min(Approval.valid) AS valid
FROM Approval
GROUP BY Approval.person,
Approval.item,
Approval.reason;
Why? Because I am not only interested in "who has valid status", but also "who ever had an approval for this item or reason, and is this approval still valid?"
Now, this works - well, sort of. However, because I have performed a Minimum aggregate function, I have automatically changed the data-type from Yes/No to Numerical (I used the minimum aggregate function simply because I knew of no other better way to do it).
So, the question is, how do I change the numbers -1 &开发者_如何学编程amp; 0 back into a boolean value of True/False? Or, is there a better way of doing this query?
Best regards, Phil
The function CBool()
will change the number back into True or False
精彩评论