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甲骨文公司与A.K.一起制造了重复的行文。
原标题:Oracle SQL create duplicated rows with join

我愿把重复增长作为产出:首先,我要有一行,然后,同一张桌子再次加入另一个桌子。

table A with fieldA (and lots of others)

table B with fieldB (and lots of others)

产出:

fieldA1          (and all the fileds from tableA)      
fieldA1 fieldB1  (and all the fields from tableA and tableB joined) 
filedA1 fieldB2  
fieldA2 
fieldA2 fieldB8   
filedA2 fieldB9   
. . .

我正在考虑使用工会,但我不得不重复非常复杂的表格选择。 A 接上表层 表格B(表A是其他表格的结合,我只是为这个问题简化了表格)。 是否有更清洁的解决办法? 我知道这是一个不寻常的问题,因此,我会理解任何 thou或想法。

非常感谢你们。

最佳回答

2. 修改本戈特的答复,使用共同表格表达方式:

WITH A as (
 your select for "A"
)
SELECT A.fieldA, B.fieldB, A.*, B.*
  FROM A LEFT JOIN B ON 1 = 0
UNION ALL
SELECT A.fieldA, B.fieldB, A.*, B.*
  FROM A JOIN B ON (join condition)
问题回答

使用:

SELECT A.*, B.*
  FROM A LEFT JOIN B ON 1 = 0
 UNION ALL
SELECT A.*, B.*
  FROM A INNER JOIN B ON (join condition)




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