（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);SELECT *
SELECT * FROM b_c_s1 where CT_ID IN (SELECT DISTINCT CT_ID FROM b_c_s1 LIMIT 0,2);SELECT *
阅读背景：
Mysql limit 子查询
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