Question

我有两个表A和表B.

表A包含列colA，其中包含值（1,3,5,7）

表B包含列colB，其中包含值（2,4,6,8）

我的查询是如何组合这两个表并获得一列输出（1,2,3,4,5,6,7,8）

我正在使用oracle 10g

Answer 1

也许：

SELECT colA FROM A
 UNION ALL
SELECT colB FROM B

如果你关心秩序和单一性：

SELECT colA FROM A
 UNION
SELECT colB FROM B

Answer 2

这会有用......

SELECT * FROM 
(
SELECT colA AS TEMP_COL FROM A  
UNION 
SELECT colB AS TEMP_COL FROM B 
)
ORDER BY TEMP_COL

Answer 3


with A as (
            select 1 as cola from dual
            union all 
            select 2 as cola from dual 
            union all 
            select 3 as cola from dual
           ),
     B as (
            select 4 as colb from dual 
            union all 
            select 5 as colb from dual 
            union all 
            select 6 as colb from dual
            )

select substr(SYS_CONNECT_BY_PATH(colab, ','),2) col_list 
from 
   ( 
    select colab,
           count(*) over (partition by 1) as cnt,
           ROW_NUMBER () OVER ( partition by 1 order by colab) seq 
    from 
        ( 
         select cola as colab from A 
         union all 
         select colb as colab from B
         )
    ) 
where cnt = seq
start with seq = 1 
connect by prior seq + 1 = seq

或


select 
   rtrim (xmlagg (xmlelement (el, colab || ',')).extract ('//text()'), ',') col_list
from 
        ( 
         select cola as colab from A 
         union all 
         select colb as colab from B
         )

此致..

Answer 4

对于10g，尝试 -

SELECT WMSYS.WM_CONCAT( SELECT Cola as Colab FROM A UNION ALL SELECT Colb AS Colab FROM B ) FROM DUAL;

如何组合来自不同表的两列并获得单列

4 个答案: