SQL case when set variable

问题

I am trying to set 2 declared variable with case when blocks

Here's my code:

DECLARE @like bit,@dislike bit
if exists
( select * 
    ,@like = (CASE WHEN likeordislike = 1 THEN 'true' ELSE 'false' END)
    ,@dislike=(CASE WHEN likeordislike = 0 THEN 'true' ELSE 'false' END)
  from likeordislike
)

But when I execute query throws errors:

Msg 102, Level 15, State 1, Line 4
Incorrect syntax near '='.

Everything is ok? Couldn't understand

回答1:

if (select count(*) from likeordislike where user = @user and comment_id = @comment_id) = 0
begin
  insert into likeordislike etc
end 
else
  update likeordislike etc
end

来源：https://stackoverflow.com/questions/15935334/sql-case-when-set-variable