criteria problem

Posted on 2002-07-25
Last Modified: 2008-03-06
here is my criteria:
WHERE     (qb.BehaviorID LIKE COALESCE (dbo.fnGetFrmAdvOptions_filBehavior(), '%')) AND
                      (qb.CategoryID1 LIKE COALESCE (dbo.fnGetFrmAdvOptions_filCategory(), '%'))

i am having problems because it is trying to force the % into  a numeric-- and it cant..

here is the full sql

SELECT     qb.COrder, qb.BOrder, qb.Category, qb.Behavior, sum2.SumOfSafes1 AS SumOfSafes, sum2.SumOfConcerns1 AS SumOfConcerns,
                      sum2.CountOfBehaviorID1 AS Sample, sample1.CountOfBehaviorID1 AS SampleTot,
                      sum2.SumOfSafes1 / NULLIF (sum2.SumOfSafes1 + sum2.SumOfConcerns1, 0) AS pSafe
FROM         dbo.qryBeh() qb LEFT OUTER JOIN
                      dbo.rpqOverview_Sample1() sample1 ON qb.BehaviorID = sample1.BehaviorID LEFT OUTER JOIN
                      dbo.rpqOverview_sum2() sum2 ON qb.BehaviorID = sum2.BehaviorID
WHERE     (qb.BehaviorID LIKE COALESCE (dbo.fnGetFrmAdvOptions_filBehavior(), '%')) AND
                      (qb.CategoryID1 LIKE COALESCE (dbo.fnGetFrmAdvOptions_filCategory(), '%'))
Question by:__Holly__
  • 2
LVL 75

Accepted Solution

Anthony Perkins earned 200 total points
ID: 7179295
From MSDN:
Returns the first nonnull expression among its arguments.
All expressions must be of the same type or must be implicitly convertible to the same type.

What are you trying to do?


Expert Comment

ID: 7179657
If you want to use like with an Int column you have to either rearange the query or convert to varchar

drawback of converting is that the int will be compared litteraly and doe to the function index on id col wont be used.

but it seems to me that you want all id's if the function returns null right?
then use

where (dbo.fnGetFrmAdvOptions_filBehavior()is null OR  (qb.CategoryID1 = ISNULL(dbo.fnGetFrmAdvOptions_filCategory(), 0))  ' Debending on ansi settings you need the isnull function because of null propagation, the null replacement value doesn't matter because when function returns null all values are selected anyway.

Author Comment

ID: 7180772
man are you sure you arent talking about the NullIf function, instead of the IsNull function?

Expert Comment

ID: 7184795
where part:
dbo.fnGetFrmAdvOptions_filBehavior() is null
    will return all data if function returns Null

(qb.CategoryID1 = ISNULL(dbo.fnGetFrmAdvOptions_filCategory(), 0))

If function returns null, this will be treated as 0 to avoid  the  where fn is Null or fn = Null structure
because fn = Null will depending on ANSI Settings either return True or Null if it returns Null it'll invalidate the whole whereclause leading to no rows selected instead of all rows selected.
If function Returns an IDnr, ISNULL(fn, 0) will return the IDnr and compare it against the field.

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