加入两个表时，在两列中的值不匹配

Question

表1：

onode_c, dnode_c, dist1 

表2：

onode_c, dnode_c, dist2 

我需要一个查询这对于返回

onode_c, dnode_c, dist1, dist2 

dist1和dist2在表1和表2中不匹配的记录

select a.onode_c, a.dnode_c, trunc(a.dist1), trunc(b.dist2) 
from table1 a, table2 b 
where a.onode_c = b.onode_c and a.dnode_c = b.dnode_c and trunc(a.dist1) != trunc(b.dist2); 

上述查询多次返回相同的记录。

Answer 1

试试下面的语句：

select a.onode_c, a.dnode_c, trunc(a.dist), trunc(b.dist2) from table1 a 
left join table2 b on a.onode_c = b.onode_c and a.dnode_c = b.dnode_c 
where trunc(a.dist1) != trunc(b.dist2); 

Answer 2

尝试使用SELECT DISTINCT也许

Answer 3

试试这个：

select DISTINCT a.onode_c, a.dnode_c, trunc(a.dist1), trunc(b.dist2) 
from table1 a, table2 b 
where a.onode_c = b.onode_c and a.dnode_c = b.dnode_c and trunc(a.dist1) != trunc(b.dist2);