Case statement inside trigger

Question

create trigger Insert_emp on dbo.emp
after insert
as
begin

declare @tablename varchar(50)
declare @rdatetime varchar(20)
declare @month int

set @rdatetime = (select Bdate from inserted)
set @month = (select datepart(mm,@rdatetime))
case when @month = 2 then set @tablename = 'FEP_EMP' end
print @tablename 
end

Trigger will execute after,inserting record in emp table.It will pick up date which is inserted.From that date month will be calculated.I want set value of tablename.

Answer 1

CASE in SQL Server can only be used to get scalar values - it cannot be used to decide which code block or statement to execute. To handle conditional code execution, use the regular IF / ELSE statements.

Change your trigger to something like:

create trigger Insert_emp on dbo.emp
after insert
as
begin

   declare @tablename varchar(50)
   declare @rdatetime varchar(20)
   declare @month int

   set @rdatetime = (select Bdate from inserted)
   set @month = (select datepart(mm,@rdatetime))

   IF @month = 2 
      set @tablename = 'FEP_EMP' 

   print @tablename 
end