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Selective Where statement

Posted on 2011-09-30
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Last Modified: 2012-05-12
In my "where" section that's attached I need to use ONLY @searchName if len(@searchName) > 0

Otherwise use the @firstName or @lastName and NOT @searchName at all
Where	l.last_name Like '%' + IsNull(@lastName, l.last_name) + '%'
				or
			l.first_name Like '%' + IsNull(@firstName, l.first_name) + '%'
				or
			p.name like '%' + isnull(@searchName, p.name) + '%'

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Question by:lrbrister
5 Comments
 
LVL 21

Expert Comment

by:JestersGrind
ID: 36891487
You can use a case statement to create a conditional where clause.  Try this.

Greg


Where	l.last_name Like '%' + IsNull(@lastName, l.last_name) + '%'
				or
			l.first_name Like '%' + IsNull(@firstName, l.first_name) + '%'
				or
			--p.name like '%' + isnull(@searchName, p.name) + '%'
			p.name LIKE CASE WHEN LEN(@searchName) = 0 THEN p.name ELSE '%' + @searchName + '%' END

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tim_cs earned 500 total points
ID: 36891506
WHERE
      ((l.last_name Like '%' + IsNull(@lastName, l.last_name) + '%' OR l.first_name Like '%' + IsNull(@firstName, l.first_name) + '%') AND LEN(@searchName) = 0)
      OR (p.name like '%' + isnull(@searchName, p.name) + '%' AND LEN(@searchName) > 0)

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LVL 18

Expert Comment

by:lludden
ID: 36891507
Where (len(@searchName) > 0 AND p.name like '%' + isnull(@searchName, p.name) + '%')
OR
            (len(@searchName) = 0 AND l.last_name Like '%' + IsNull(@lastName, l.last_name) + '%')
                        or
            (len(@searchName) = 0 AND l.first_name Like '%' + IsNull(@firstName, l.first_name) + '%')

                  
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Author Closing Comment

by:lrbrister
ID: 36891606
This is final solution with actual valid data returned.
Thanks

WHERE
      ((l.last_name Like '%' + IsNull(@lastName, l.last_name) + '%' and l.first_name Like '%' + IsNull(@firstName, l.first_name) + '%') AND LEN(@searchName) = 0)
      OR (p.name like '%' + isnull(@searchName, p.name) + '%' AND LEN(@searchName) > 0)
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LVL 9

Expert Comment

by:sachinpatil10d
ID: 36891654
If you want to conditional statement in where clause, Dynamic Sql is the only option available.
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