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SQL 问题紧急求助
forex
(我认为)
有多个表用UNION联合查询得到结果,如何去除其中的重复项.例如:
SELECT COL_1
FROM TABLE_A
UNION
SELECT COL_3
FROM TABLE_B
得到结果
1
1
2
3
3
4
5
6
如何得到没有重复的1到6的结果? 多谢!!!
(#277741@0)
Last Updated: 2001-11-27
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SQL 问题紧急求助
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