how to use case statement in if -else condition

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SQL-Server-2005

in my query
if the input parameter is numeric i want to check one condition otherwise another condition.
for example

SQL

if(case 
when (isnumeric(@parameter)) then exist(select name from table where id=@paramter)
else
length(@parameter)>1
end)

Posted 24-Mar-13 19:22pm

josh-jw

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Mike Meinz · Answer 1 · 2013-03-25T13:01:00

Based on the code that you showed in your question, it does not look like the CASE statement is a good choice. The "exists" function returns a Boolean value (True|False). You are trying to use it in the "Then" clause of a When statement. The Transact-SQL grammar does not allow that.

Try something like this:

SQL

declare @parameter varchar(10);
declare @x int;

if isnumeric(@parameter)=1
    begin
    if exists(select name from [table] where id=@parameter)
        Begin
        Select @x=1
        End
    Else
        Begin
        Select @x=2
        End
    End
Else
    Begin
    if len(@parameter)>1
        Begin
        Select @x=3
        End
    Else
        Begin
        Select @x=4
        End
    End

Tested: SQL Server Express 2012