选择将同一列的所有行数据放入一列

Posted 2023-03-25

【中文标题】选择将同一列的所有行数据放入一列

【英文标题】：Select to get all rows data of same column into one column

【发布时间】：2015-12-31 09:21:31

【问题描述】：

我有一个包含 3 列 (ColA,ColB,ColC) 的表 (TableA)

ColA 和 ColB 是主键

select *
from TableA
where ColA = '001';

给我这个

COLA COLB      COLC 
---- ----- -------- 
001  AA1        460  
001  AB1        380 
001  AC1        950  

我需要这种格式的结果

COLA         COLB         COLC
-----------  -----------  -------- 
001,001,001  AA1,AB1,AC1  460,380,950

即所有结果行合并到一行中，该列的值对应于相应列。

【问题讨论】：

可能重复***.com/questions/4686543/…

【参考方案1】：

你可以使用LISTAGG:

WITH tableA AS 
(
 SELECT '001' AS COLA, 'AA1' AS COLB, 460 AS COLC FROM dual
 UNION ALL SELECT '001','AB1',380 FROM dual
 UNION ALL SELECT '001','AC1',950 FROM dual
)
SELECT DISTINCT 
   LISTAGG(COLA, ', ') WITHIN GROUP (ORDER BY 1) AS COLA,
   LISTAGG(COLB, ', ') WITHIN GROUP (ORDER BY 1) AS COLB,
   LISTAGG(COLC, ', ') WITHIN GROUP (ORDER BY 1) AS COLC
FROM tableA
WHERE COLA = '001';

SqlFiddleDemo

输出：

╔════════════════╦════════════════╦═══════════════╗
║     COLA       ║     COLB       ║     COLC      ║
╠════════════════╬════════════════╬═══════════════╣
║ 001, 001, 001  ║ AA1, AB1, AC1  ║ 380, 460, 950 ║
╚════════════════╩════════════════╩═══════════════╝

---

但我还要添加OVER 子句并从COLA 中删除重复项：

WITH tableA AS 
(
 SELECT '001' AS COLA, 'AA1' AS COLB, 460 AS COLC FROM dual
 UNION ALL SELECT '001','AB1',380 FROM dual
 UNION ALL SELECT '001','AC1',950 FROM dual
)
SELECT DISTINCT 
   COLA,
   LISTAGG(COLB, ', ') WITHIN GROUP (ORDER BY 1) OVER(PARTITION BY COLA) AS COLB,
   LISTAGG(COLC, ', ') WITHIN GROUP (ORDER BY 1) OVER(PARTITION BY COLA) AS COLC
FROM tableA
WHERE COLA = '001';

SqlFiddleDemo2 SqlFiddleDemo3

【讨论】：

你先生应该获得奖牌。