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WHERE CLAUSE problem

Posted on 2012-03-28
5
180 Views
Last Modified: 2012-03-28
How do I in where clause to select correct data in the following statement:
--------------------------------------------------------------------------------------
select name, date1, date2, date3
from table
where name=@Param and
 case
    when @Param ="a",   date1 between '2/1/2012' and '2/29/2012'  THEN 1
    when @Param="b", date2 between '2/1/2012' and '2/29/2012'  THEN 1
    when @Param ="c", date3 between '2/1/2012' and '2/29/2012'  THEN 1
    else 0
end =1

I only get 2 row. I should have 125.
---------------------------------------------------------------------------
--------------------------------------------------------------------------------------
select name, date1, date2, date3
from table
where name=@Param and
 ( date1 between '2/1/2012' and '2/29/2012' or    
   date2 between '2/1/2012' and '2/29/2012'  or
   date3 between '2/1/2012' and '2/29/2012' )

Obviously,   '2/1/2012' and '2/29/2012'  won't limited all dates because of  "or "

Appreciate for great  help!
0
Comment
Question by:sharon2011
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5 Comments
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 37778073
Have you tried this:
WHERE   name = @Param
        AND CASE WHEN @Param = "a"
                      AND date1 BETWEEN '2/1/2012' AND '2/29/2012' THEN 1
                 WHEN @Param = "b"
                      AND date2 BETWEEN '2/1/2012' AND '2/29/2012' THEN 1
                 WHEN @Param = "c"
                      AND date3 BETWEEN '2/1/2012' AND '2/29/2012' THEN 1
                 ELSE 0
            END = 1

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0
 
LVL 40

Accepted Solution

by:
lcohan earned 500 total points
ID: 37778083
Is this what you want to achieve?


select name, date1, date2, date3
from table_name
where name=@Param OR
 case
    when @Param ='a' and date1 between '2/1/2012' and '2/29/2012'  THEN 1
    when @Param='b' and date2 between '2/1/2012' and '2/29/2012'  THEN 1
    when @Param ='c' and date3 between '2/1/2012' and '2/29/2012'  THEN 1
    else 0
end =1
0
 
LVL 75

Expert Comment

by:Anthony Perkins
ID: 37778084
Or:
WHERE   name = @Param AND (
        @Param = 'a' AND date1 BETWEEN '20120201' AND '20120229' OR
        @Param = 'b' AND date2 BETWEEN '20120201' AND '20120229' OR
        @Param = 'c' AND date2 BETWEEN '20120201' AND '20120229')

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0
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 37778456
In case date1 and date2 are datetime, or converted to datetime, I suggest this style for checking dates instead:

WHERE   name = @Param AND (
        (@Param = 'a' AND date1 >= '20120201' AND date1 < '20120301') OR
        (@Param = 'b' AND date2 >= '20120201' AND date2 < '20120301') OR
        (@Param = 'c' AND date2 >= '20120201' AND date2 < '20120301') )

Technically I don't think you need the extra parens, but in my view it makes it clearer to the reader.
0
 

Author Comment

by:sharon2011
ID: 37778489
Thank you all. I found the reason I only got 2 rows instead of 125. There is another condition that need included NULL value. So the where clause should be:

where name=@Param and (division in (@div) or division is null)
and
 case
    when @Param ='a' and date1 between '2/1/2012' and '2/29/2012'  THEN 1
    when @Param='b' and date2 between '2/1/2012' and '2/29/2012'  THEN 1
    when @Param ='c' and date3 between '2/1/2012' and '2/29/2012'  THEN 1
    else 0
end =1
0

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