示例表 tb 数据如下
id value
—————
1 aa
1 bb
2 aaa
2 bbb
2 ccc
第一种
@H_403_17@
第一种显示结果
SELECT
id,
[
val
]
=
(
SELECT
[
value
]
+
'
,
'
FROM
tb
AS
b
WHERE
b.id
=
a.id
FOR
XML PATH(
''
) )
FROM
tb
AS
a
1 aa,bb,
1 aa,
2 aaa,bbb,ccc,
第二种
@H_403_17@
第二种显示结果
SELECT
id,
'
FROM
tb
AS
b
WHERE
b.id
=
a.id
FOR
XML PATH(
''
) )
FROM
tb
AS
a
GROUP
BY
id
1 aa,
第三种 （用STUFF函数替换掉首端的逗号）
@H_403_17@
第三种显示结果
SELECT
id,
[
val
]
=
STUFF
( (
SELECT
'
,
'
+
[
value
]
FROM
tb
AS
b
WHERE
b.id
=
a.id
FOR
XML PATH(
''
)),
1
,
''
)
FROM
tb
AS
a
GROUP
BY
id
1 aa,bb
2 aaa,ccc
STUFF 函数将字符串插入另一字符串。它在第一个字符串中从开始位置删除指定长度的字符；然后将第二个字符串插入第一个字符串的开始位置。
STUFF ( character_expression,start,length,character_expression_insert )
第四种 （用REPLACE函数将所有空格替换成逗号）
@H_403_17@
结果与第三种一样。
SELECT
id,
[
val
]
=
REPLACE
( (
SELECT
[
value
]
AS
[
data()
]
FROM
tb
AS
b
WHERE
b.id
=
a.id
FOR
XML PATH(
''
)),
'
'
,
'
,
'
)
FROM
tb
AS
a
GROUP
BY
id
