Question

如何将多行合并为一行：

Example:
ID   NAME    NUMBER
24   infill  20
25   test1   10
26   test2   30
27   test5   35
28   test3   40

SELECT 
      name,
      number 
FROM table1 WHERE table1.id IN (24,26,28)

他们的结果如下：

NAME    NUMBER
infill  20
test2   30
test3   40

如何修改上面的SQL语句：我有一个我真正想要的列名。

服务

infill 20,test2 30, test3 40

我做了：

select name + " " + number as Service 
from table1
where table1.id in (24,26,28)

结果是NULL，谢谢大家回复我的问题。

Answer 1

你很接近，因为你试图用Int来连接varchar，所以concat没有工作的原因。

为了连接，两列必须具有相同的数据类型，请尝试这样：

SELECT name + ' ' + Convert(nvarchar(max), number) AS Service 
FROM table1
WHERE table1.id IN (24,26,28)

Answer 2

这是

DECLARE @Str Varchar(max) = ''
SELECT @Str = @Str + Name + ' ' + CAST(Number As varchar) + ', ' AS Service FROM table1
WHERE table1.id in (24,26,28)
SELECT SUBSTRING(@Str, 0, LEN(@Str) - 2) AS Result

<强>更新

更简单

DECLARE @Str Varchar(max) 
SELECT @Str = COALESCE(@Str + ', ','') + Name + ' ' + CAST(Number As varchar) AS Service
FROM table1
WHERE table1.id in (24,26,28)
SELECT @Str AS Result

Answer 3

试试这个

  DECLARE @MyTable TABLE
  (
     ID     INT,
     NAME   VARCHAR(100),
     NUMBER INT
  )

INSERT INTO @MyTable
VALUES      (24,
             'infill',
             '20'),
            (25,
             'test1',
             '10'),
            (26,
             'test2',
             '30'),
            (27,
             'test5',
             '35'),
            (28,
             'test3',
             '40')

SELECT stuff((SELECT ',' + NAME + ' ' + CONVERT(VARCHAR(100), NUMBER)
              FROM   @MyTable
              WHERE  id IN ( 24, 26, 28 )
              FOR XML PATH('')), 1, 1, '') AS SERVICE

使用SQL时将多行合并为一行（一列）

3 个答案: