select * from gc_dfys union select * from ls_jg_dfys
select * from gc_dfys union all select * from ls_jg_dfys
(SELECT a FROM tbl_name WHERE a=10 AND B=1) UNION (SELECT a FROM tbl_name WHERE a=11 AND B=2) ORDER BY a LIMIT 10;
select userid from ( select userid from testa union all select userid from testb) t order by userid limit 0,1;
select userid from (select userid from testa union all select userid from testb) t group by userid having count(userid) = 2;
Error writing file '/tmp/MYLsivgK' (Errcode: 28)
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