How do I use case condition.

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SQL-Server-2014

I am using case condition to get a result if i want to fetch 4 weeks then it can fetch 4
or if i want to fetch 5 weeks then it can fetch 5 weeks.
can you please help me out.

What I have tried:

Where case when len(Week)='24' then WEEK IN ('82','83','84','88','99')
else
when len(Week)='19' then WEEK IN ('82','83','84','88')
Go
--

Posted 19-Apr-17 5:21am

Member 13138564

Updated 19-Apr-17 10:07am

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CHill60 19-Apr-17 11:47am

You can't. You'll need to use Dynamic SQL. What is "Week"?

Word of warning LEN(variable) returns an integer result not a varchar.

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CHill60 · Accepted Answer · 2017-04-19T10:07:00

Solution 1

Further to my earlier comment here is a specific example:

SQL

declare @c varchar(50) = '123456789012345678901234'

declare @sql nvarchar(max) = 'select * from xxx
WHERE WEEK in '
IF len(@c) > 24 
BEGIN
	SET @sql = @sql + '(''81'',''82'',''84'',''83'')'
END
ELSE 
BEGIN
	SET @sql = @sql + '(''81'',''82'',''84'',''83'',''86'')'
END
--PRINT @sql
EXEC sp_sqlexec @sql

Posted 19-Apr-17 10:07am

CHill60

Updated 19-Apr-17 21:49pm

v2

Comments

Member 13138564 19-Apr-17 18:56pm

Yeah i am using dynamic sql for this and week get changes let say example
for today i want to fetch '81','82','84','83'
and on another day i want to fetch 5 weeks from database i.e '81','82','84','83','86'

CHill60 20-Apr-17 3:50am

I've changed my solution to make it more obvious what you need to do.