SQL syntax for "if exists"

Why I'm getting this error:

#1064 - You have an error in your SQL syntax;  
check the manual that corresponds to your MySQL server version 
for the right syn开发者_如何学Ctax to use near 
'IF EXISTS(SELECT id FROM mytable WHERE id = '1')' at line 1 

My SQL query:

IF EXISTS(SELECT id FROM mytable WHERE id = '1')

Thanks.

IF EXISTS only works in a stored procedure. Outside of a stored procedure, IF() is a function which takes 3 arguments. Proper usage would be

SELECT IF(EXISTS(SELECT `column` FROM `table` WHERE `id` = `1`), 1, 0);

Not on a MySQL machine right now but it looks like its because the statement is incomplete, you need to tell it what to do if the id exists.

IF EXISTS(...) do something

IF EXISTS doesn't make any sense in MySQL. See subqueries with EXISTS or NOT EXISTS in the MySQL documentation on usage.

Basically, you need to use it in a statement, and not just like a logical block

Try to use

Declare @ID Integer
Select @ID=id From mytable where id=1
IF @ID is not null    OR  IF @ID > 0
Begin
....
End