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13.8. UNION

union 分页问题

(SELECT a FROM tbl_name_a WHERE a=10 AND B=1)
UNION
(SELECT a FROM tbl_name_b WHERE a=11 AND B=2)
ORDER BY a LIMIT 10;
		
select * from (
	select a from tbl_name_a WHERE a=10 AND B=1
	union all
	select a from tbl_name_b WHERE a=10 AND B=1
) tbl_name
order by a limit 0,1;
		

13.8.1. UNION ALL

UNION ALL 不会合并重复的记录

select a,b from tbl_name_a WHERE a=10 AND B=1
union all
select a,b from tbl_name_b WHERE a=10 AND B=1