sqlite:
table A(aID, aName);
值 1, a1
2, a2
table B(bID, bName);
值 1, b1
2, b2
table C(cID, nameType, nameid); nameType=1存放A表的aID到nameid,nameType=0 存放B表的bID到nameid
值 1, 1, 1
2, 0, 1
3, 1, 2
4, 0, 2
用什么方法根据c表的 nameType, nameid字段可以打印出c表存放的对应A,B的name
------解决方案--------------------------------------------------------
select * from c
left join
(select 1 as bz,* from a
union all
select 0 as bz,* from b
) d
on c.nameType=d.bz and c.nameid=d.aID
------解决方案--------------------------------------------------------
select case nameType when 1 then (select aName from a where aID=nameid) when 0...