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opolmzy 2003-10-09
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（select * from biao） union (select * from baio2)
如果想保留所有重复，必须用union all代替union
（select * from biao） union all (select * from baio2)
如果想保留所有重复，必须用union all代替union
（select * from biao） union all (select * from baio2)
zhanghao5188 2003-10-08
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合并union
select * from biao union (select * from baio2)
select * from biao union (select * from baio2)
Tal 2003-10-07
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数据库是什么
select a.* from (select * from atable where id is not null) a,btable b where a.id=b.id
select a.* from (select * from atable where id is not null) a,btable b where a.id=b.id
junsunchen 2003-10-07
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union
sunnylake 2003-10-07
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union
007james 2003-10-07
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合并union
zlydaaa 2003-10-07
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union
