mickyT (11/15/2012)
It's a bit ugly ... but you could do something like
;with companyNotNull as (SELECT * FROM #Companies WHERE CompanyID = @CompanyID
),
companyNull as (
Select CompanyID FROM #CompanyGroups WHERE CompanyGroupID = @CompanyGroupID
)
SELECT *
FROM companyNotNull
WHERE @companyID is not null
UNION ALL
SELECT *
FROM companyNull
WHERE @companyID is null
Of course this replicates the if ... then ... else structure. If both values are set then the companyID takes precedence.
It occurred to me on lookback that this is going to fail if #Companies has more than one column or that column has a data type that is incompatible with CompanyID from #CompanyGroups.
My thought question: Have you ever been told that your query runs too fast?
My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.
Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
Since random numbers are too important to be left to chance, let's generate some![/url]
Learn to understand recursive CTEs by example.[/url]
[url url=http://www.sqlservercentral.com/articles/St