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sql script help in using case statment with a select statement

Posted on 2014-12-19
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Last Modified: 2014-12-19
i am new to sql scripting.  Basically all I am trying to do is to output one column called 'Rev' based on the two case statements below.  The scripting works for the most part.  The only problem is that it outputs two columns called 'Rev'.  i just need one column.  So if the first case statement condition is not found, then move to the second case condition etc.

DECLARE @FullName   VARCHAR(100)
SET @FullName = '07000496_C.F2'

SELECT
            case when @FullName like '%_%' and @FullName not like '%.%' then SUBSTRING(@FullName, CHARINDEX('_', @FullName) + 1, LEN(@FullName)) end AS Rev,
            case when @FullName like '%_%' and @FullName like '%.%' then SUBSTRING(@FullName, CHARINDEX('.', @FullName) + 1, LEN(@FullName)) end AS Rev




Thank you.
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Question by:sxxgupta
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Simon earned 500 total points
ID: 40509068
DECLARE @FullName   VARCHAR(100)
SET @FullName = '07000496_C.F2'

SELECT
            case when @FullName like '%_%' and @FullName not like '%.%' then SUBSTRING(@FullName, CHARINDEX('_', @FullName) + 1, LEN(@FullName)) 
             when @FullName like '%_%' and @FullName like '%.%' then SUBSTRING(@FullName, CHARINDEX('.', @FullName) + 1, LEN(@FullName)) end AS Rev

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the syntax for each case is just to separate with ' when ', rather than 'end as Rev,'

For sanity, you should probably include an 'else' case as well.
SELECT
            case when @FullName like '%_%' and @FullName not like '%.%' then SUBSTRING(@FullName, CHARINDEX('_', @FullName) + 1, LEN(@FullName)) 
             when @FullName like '%_%' and @FullName like '%.%' then SUBSTRING(@FullName, CHARINDEX('.', @FullName) + 1, LEN(@FullName)) 
else
'n/a' 
end AS Rev

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LVL 65

Expert Comment

by:Jim Horn
ID: 40509070
CASE statements support multiple WHEN .. THEN statements, where SQL executions them sequentially until one WHEN expression evaluates to True, then returns what's in the THEN.

SELECT CASE
  WHEN @FullName like '%_%' and @FullName not like '%.%' 
      THEN SUBSTRING(@FullName, CHARINDEX('_', @FullName) + 1, LEN(@FullName))
  WHEN @FullName like '%_%' and @FullName like '%.%' 
      THEN SUBSTRING(@FullName, CHARINDEX('.', @FullName) + 1, LEN(@FullName)) 
  END AS Rev

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I have an article out there called SQL Server CASE Statments that illustrates multiple WHEN..THEN, nested statements, and many other features of CASE statements.   If it helps please click the big green 'Was this article helpful?' button at the end of the article.
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LVL 47

Expert Comment

by:Vitor Montalvão
ID: 40509075
You just need a CASE statement:
SELECT case 
            when @FullName like '%_%' and @FullName not like '%.%' then SUBSTRING(@FullName, CHARINDEX('_', @FullName) + 1, LEN(@FullName)) 
            when @FullName like '%_%' and @FullName like '%.%' then SUBSTRING(@FullName, CHARINDEX('.', @FullName) + 1, LEN(@FullName)) 
    end AS Rev

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LVL 47

Expert Comment

by:Vitor Montalvão
ID: 40509082
Damn. I knew I should refresh the page before clicking in the Submit button!
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LVL 18

Expert Comment

by:Simon
ID: 40509085
Also underscore is a wildcard character. You should use [_] to represent the literal.
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Author Closing Comment

by:sxxgupta
ID: 40509087
Thank you everyone.  Much appreciated.
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LVL 65

Expert Comment

by:Jim Horn
ID: 40509088
<Frazier Crane>  When you know the answer it's hard not to hit the button..
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LVL 18

Expert Comment

by:Simon
ID: 40509094
Final version with [ and ] around the underscore (otherwise LIKE treats it as a wildcard representing any single character):
SELECT
            case when @FullName like '%[_]%' and @FullName not like '%.%' then SUBSTRING(@FullName, CHARINDEX('_', @FullName) + 1, LEN(@FullName)) 
             when @FullName like '%[_]%' and @FullName like '%.%' then SUBSTRING(@FullName, CHARINDEX('.', @FullName) + 1, LEN(@FullName)) 
else  -- if you omit this you would get NULL by default for unmatched cases
'n/a' 
end AS Rev

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MSDN reference for the LIKE operator
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