Mysql limit子查询语句
（1）mysql limit 不支持子查询像下面这条语句无法执行
SELECT * FROM b_c_s1 where CT_ID IN
(SELECT DISTINCT CT_ID FROM b_c_s1 LIMIT 0,2);
（2）应该在只查询外面再加一个查询
SELECT * FROM b_c_s1 where CT_ID IN (SELECT a.CT_ID FROM
(SELECT DISTINCT CT_ID FROM b_c_s1 LIMIT 0,2) a)