>I have encountered some behaviour in VFP8 that seems like an optimisation setting has changed.
>
>When issuing a query like:
>
>

>SELECT * FROM table WHERE (field = 'abc' and SomeFunction(field))
>

>
>In the past, this query would test field='abc', and if not, not carry out the second test SomeFunction(field). This behaviour allows select commands to be optimised - check the quick things before checking the slow things.
>
>However, in VFP 8 every single expression in an SQL command appears to be evaluated. In the above example the SomeFunction(field) test is always carried out, regardless of whether field = 'abc'.
>
>Can anyone confirm that this is the case, and if so is there a setting that will return behaviour to the VFP7 standard. I have looked at SET OPTIMIZE and SET ENGINEBEHAVIOUR, and neither seems to affect the query.

Hi Dominic,

The following code behaves exactly the same way under VFP 6-8. It evaluates the function for every record.

CREATE CURSOR Test (Field1 N(10))
FOR lnCount = 1 TO 20
	INSERT INTO Test VALUES (lnCount)
ENDFOR

SELECT * FROM Test ;
	WHERE Field1 >= 10 AND IsEven(Field1)

FUNCTION IsEven(tnNumber)
	? "Number is: " + TRANSFORM(tnNumber)
	RETURN (MOD(tnNumber, 2) = 0)
ENDFUNC