Sql server 分组方式，用于将数据分组为字符串格式

我有一个表，其中包含下面给出的一些数据。它使用树状结构

i、 e

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我想代表部门对我的记录进行分组，然后是直属家长，然后是首选项，每个首选项之间用“，”分隔

i、 e

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在实际场景中，所有这些都是我的ID，将由它们的字符串字段替换

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我使用的是SQL server 2k5，您可以在子查询中使用FOR XML PATH来获取逗号分隔的值列表。然后按键字段分组，以获得正确的值

第一个问题

SELECT
    [Department_Id],
    STUFF(
    (
        SELECT
            ',' + CONVERT(varchar(10), [ImediateParent])
        FROM
            [YourTable] [YourTable2]
        WHERE
            [YourTable2].[Department_Id] = [YourTable].[Department_Id]
        FOR XML PATH('')
    ), 1, 1, ''),
    STUFF(
    (
        SELECT
            ',' + CONVERT(varchar(10), [Preferences])
        FROM
            [YourTable] [YourTable2]
        WHERE
            [YourTable2].[Department_Id] = [YourTable].[Department_Id]
        FOR XML PATH('')
    ), 1, 1, '')
FROM
    [YourTable]
GROUP BY
    [YourTable].[Department_Id]

至于你的第二个问题

SELECT
    [ImediateParent],
    STUFF(
    (
        SELECT
            ',' + CONVERT(varchar(10), [Preferences])
        FROM
            [YourTable] [YourTable2]
        WHERE
            [YourTable2].[ImediateParent] = [YourTable].[ImediateParent]
        FOR XML PATH('')
    ), 1, 1, '')
FROM
    [YourTable]
GROUP BY
    [YourTable].[ImediateParent]

department  Immediate Parent  preferences
1             5,6                 14,15,16
2             4,3,20,13           9,4,24,25,23

and this table also

Immediate parent  preferences
5                     14,15
6                     16
4                     9
3                     4
20                    24,25
13                    13

SELECT
    [Department_Id],
    STUFF(
    (
        SELECT
            ',' + CONVERT(varchar(10), [ImediateParent])
        FROM
            [YourTable] [YourTable2]
        WHERE
            [YourTable2].[Department_Id] = [YourTable].[Department_Id]
        FOR XML PATH('')
    ), 1, 1, ''),
    STUFF(
    (
        SELECT
            ',' + CONVERT(varchar(10), [Preferences])
        FROM
            [YourTable] [YourTable2]
        WHERE
            [YourTable2].[Department_Id] = [YourTable].[Department_Id]
        FOR XML PATH('')
    ), 1, 1, '')
FROM
    [YourTable]
GROUP BY
    [YourTable].[Department_Id]

SELECT
    [ImediateParent],
    STUFF(
    (
        SELECT
            ',' + CONVERT(varchar(10), [Preferences])
        FROM
            [YourTable] [YourTable2]
        WHERE
            [YourTable2].[ImediateParent] = [YourTable].[ImediateParent]
        FOR XML PATH('')
    ), 1, 1, '')
FROM
    [YourTable]
GROUP BY
    [YourTable].[ImediateParent]