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up vote 2 down vote favorite

How can I write the following T-SQL query part in a shorter way without using dynamic SQL?

WHERE
    ( (@Max IS NULL OR @Type <> 'Products')
        OR (@Max IS NOT NULL AND @Type = 'Products'
            AND ProductCount >  @Max ) )

    AND ( (@Min IS NULL OR @Type <> 'Products')
        OR (@Min IS NOT NULL AND @Type = 'Products'
            AND ProductCount <  @Min ) )

    AND ( (@Max IS NULL OR @Type <> 'Vendors')
        OR (@Max IS NOT NULL AND @Type = 'Vendors'
            AND VendorCount >  @Max ) )

    AND ( (@Min IS NULL OR @Type <> 'Vendors' )
        OR (@Min IS NOT NULL AND @Type = 'Vendors'
            AND VendorCount <  @Min ) )

    AND ( (@Max IS NULL OR @Type <> 'Order')
        OR (@Max IS NOT NULL AND @Type = 'Order'
            AND OrderCount >  @Max ) )

    AND ( (@Min IS NULL OR @Type <> 'Order')
        OR (@Min IS NOT NULL AND @Type = 'Order'
            AND OrderCount <  @Min ) )
share|improve this question
3  
By "shorter", do you mean "shorter" in terms of text length, or in terms of efficiency? The first really doesn't matter-long queries can be efficient and short ones inefficient. Is the query running poorly for you? –  Todd Jun 1 '11 at 6:13
 
@Todd No performance issue with current query, i just want make it "shorter" in terms of text length –  Mithun P Jun 1 '11 at 6:15
 
maybe because you are not using it? it's definition is for posting code for peer review. –  davidsleeps Jun 1 '11 at 6:28
 
Maybe your question will inspire some people to visit the site slightly more often, and some others to come up with further interesting questions. :) –  Andriy M Jun 1 '11 at 7:37
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migrated from stackoverflow.com Jun 1 '11 at 17:34

This question came from our site for professional and enthusiast programmers.

3 Answers

up vote 5 down vote accepted

You will have to test this carefully, but the following query should work:

WHERE 
( 
  @Max IS NULL 
  OR @Type = 'Products' AND ProductCount > @Max
  OR @Type = 'Vendors'  AND VendorCount  > @Max
  OR @Type = 'Order'    AND OrderCount   > @Max
)
AND
(
  @Min IS NULL
  OR @Type = 'Products' AND ProductCount < @Min
  OR @Type = 'Vendors'  AND VendorCount  < @Min
  OR @Type = 'Order'    AND OrderCount   < @Min
)
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up vote 6 down vote

Something like this

You can rely on the NULL comparison to always give false (strictly: unknown) if @Max or @Min is NULL for the relevant CASE

WHERE
   CASE @Type
      WHEN 'Products' THEN ProductCount 
      WHEN 'Vendors' THEN VendorCount  
      WHEN 'Order' THEN OrderCount   
   END > @Max
   OR
   CASE @Type
      WHEN 'Products' THEN ProductCount 
      WHEN 'Vendors' THEN VendorCount  
      WHEN 'Order' THEN OrderCount   
   END < @Min
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2  
Pedant's corner: the NULL comparison gives UNKNOWN, not FALSE. putting a NOT in front of it will still exclude those rows. –  Damien_The_Unbeliever Jun 1 '11 at 8:21
1  
@Damien_The_Unbeliever: yes, yes, I thought about that. But didn't want to deprive anyone of their fun ;-) –  gbn Jun 1 '11 at 8:23
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up vote 2 down vote

Here's another stab at it, based on gbn's CASE idea, but using BETWEEN to avoid repeating the cases:

WHERE
   CASE @Type
      WHEN 'Products' THEN ProductCount
      WHEN 'Vendors' THEN VendorCount
      WHEN 'Orders' THEN OrderCount
   END BETWEEN IFNULL(@Min,0) AND IFNULL(@Max,99999999)

Note: IFNULL in MySQL should be replaced by ISNULL in TSQL

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