Question

我们有一个查询

SELECT `name`, `companyid`
  FROM `users`

结果可能是

Peter   | 1
Michael | 1
Tom     | 2
John    | 2
Ian     | 4

是否可以创建一个查询结果，其中每个唯一companyid值将添加一行

System  | <current companyId>

所以结果将是

Peter   | 1
Michael | 1
System  | 1
Tom     | 2
John    | 2
System  | 2
Ian     | 4
System  | 4

Answer 1

SELECT * FROM
( 
  SELECT name,companyid FROM users
  UNION ALL
  SELECT DISTINCT 'System', companyid FROM users
)
ORDER BY companyid

Answer 2

如果我理解正确，这将有效：

select *
from
(
    select name, companyid
    from users

    union all

    select distinct 'System', companyid
    from users
)a
order by companyid

Answer 3

SELECT name,companyid FROM users
UNION ALL
(
  SELECT 'System' as name, companyid 
  FROM users
  GROUP BY companyid
)

应该这样做

Answer 4

也许是这样的：

首先是一些测试数据：

DECLARE @tbl TABLE(name VARCHAR(100),companyId INT)
INSERT INTO @tbl (name,companyId)
VALUES
    ('Peter',1),
    ('Michael',1),
    ('Tom',2),
    ('Ian',4)

然后查询如下：

;WITH CTE AS
(
    SELECT
        RANK() OVER(PARTITION BY companyId ORDER BY name) RowNbr,
        tbl.companyId,
        'System' AS name
    FROM
        @tbl AS tbl
)
SELECT
    tbl.name,
    tbl.companyId
FROM
    @tbl AS tbl
UNION ALL
SELECT
    CTE.name,
    CTE.companyId
FROM
    CTE
WHERE
    CTE.RowNbr=1

Answer 5

SELECT name, companyid
  FROM users
UNION
SELECT 'System' AS name, companyid
  FROM users;

Sql查询值重复

5 个答案: