Question

我有两张桌子表A：

Fruit       Number
Apple       7235
Plum        1284
Pear        8932
Orange      2839

表B：

Fruit       Number
Apple       7235
Apple       3893
Plum        1284
Pear        8932
Orange      2839
Orange      4732

我希望查询的最终结果是获取表格不相同的列。例如New TableC：

Fruit      Number
Apple       3893
Orange      4732

我尝试进行连接但是连接仅在第一次出现记录时进行。我怎样才能达到上述预期效果。

Answer 1

使用full join可以让你在任何一方都缺少行。

select fruit,coalesce(num1,num2) as number
from (select coalesce(a.fruit,b.fruit) as fruit,a.number as num1,b.number as num2
      from a 
      full join b on a.fruit=b.fruit and a.number=b.number
      where a.number is null or b.number is null
     ) t

比较表格蜂巢之间的多个列

1 个答案: