我在遵循MySQLIF语法指南时遇到语法错误。

我的查询是：

if 0=0 then select 'hello world'; end if;

从逻辑上讲，这应该选择'hello world'，但是我得到了

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'if (0=0) then select 'hello world'' at line 1
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'end if' at line 1