Wrong number of arguments with SQL ISNULL() on Access DB
Solution 1
Just to add my two cents, and while I like the simple syntax of Nz(), if you seek trouble free performance, both IsNull() and NZ() should be avoided in favor of Is Null:
IIF(a.faultCount Is Null, 0, a.faultCount)
.
See the excellent explanation here: http://allenbrowne.com/QueryPerfIssue.html
Also, if your tables are in SQL Server or Oracle, using Nz() will force more of the query to be executed locally, with a HUGE performance impact.
Solution 2
I think that you are looking for the nz function
Nz(a.faultCount, 0)
will return 0 if the value is null
Solution 3
Microsoft Access' version of IsNull
is different than most SQL versions; it simply returns TRUE if the value is NULL, and FALSE if it isn't.
You need to basically build your own using IIF()
:
IIF(ISNULL(a.faultCount), 0, a.faultCount)
Comments
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JanT almost 2 years
I have this query in VB application on Access DB:
SELECT DISTINCT Specialization, MAX(a.faultZone) AS faultZone, ISNULL(a.faultCount, 0) AS NoOfFaults FROM Technicians AS t LEFT JOIN ( SELECT DISTINCT Faults.[Type] AS faultType, MAX(Faults.[Zone]) AS faultZone, COUNT(Faults.[Type]) AS faultCount FROM Faults " WHERE Faults.[Zone] = 8 " ' this value will be from variable GROUP BY Faults.[Type] " ) AS a ON (t.Specialization = a.faultType) WHERE t.specialization <> 'None' " GROUP BY a.faultCount, t.Specialization
It gives following problem that I can't solve...
"Wrong number of arguments used with function in query expression 'ISNULL(a.faultCount, 0'."
What I want to achieve is simply set value of
NoOFFaults
to zero, which would mean there are no faults in particular Zone.Thank You