从表中选择“记录多次”

一尘不染

从表中选择“记录多次”

sql

我有一个这样的SQL语句：

编辑：

SELECT 
    location as Location 
FROM
    Table1 
WHERE 
    OnsiteOffshore = 'Offshore' AND Acc_Code = 'ABC'

UNION

SELECT 
    Country 
FROM 
    Table1 
WHERE
    OnsiteOffshore = 'Onsite' AND Acc_Code = 'ABC'

此SQL查询给出以下结果：

Chennai
Bangalore
USA
NewZealand

但是由于某些要求，我需要这样的输出：

Chennai
Chennai
Chennai
Chennai
Bangalore
Bangalore
Bangalore
Bangalore
USA
USA
USA
USA
NewZealand
NewZealand
NewZealand
NewZealand

意思是说每个位置需要输出4次。

请帮助如何获得相同的。

阅读 123

2021-03-10

共1个答案

一尘不染

SELECT Location 
FROM Table1
  CROSS JOIN
    ( VALUES (1),(2),(3),(4)
    ) AS four(dummy)

如果4不是一个常数，而是（如@xQbert指出/要求的）是表的行数，则可以使用以下命令：

SELECT a.Location 
FROM Table1 AS a
  CROSS JOIN
     Table1 AS b

如果没有Table1任何查询（但是很复杂），则可以将其用于4个副本：

SELECT Location 
FROM (
       SELECT Location       --- complex query here
       ...                   --- inside parenthesis
     UNION 
       SELECT Country
       ...
     ) AS Table1
  CROSS JOIN
    ( VALUES (1),(2),(3),(4)
    ) AS four(dummy)

或此n副本：

WITH cte AS
  ( SELECT Location       --- complex query here
    ...                   --- inside parenthesis
    UNION 
    SELECT Country
    ...
  )
SELECT a.Location 
FROM cte AS a
  CROSS JOIN
     cte AS b

2021-03-10