for path多行变一列

最新推荐文章于 2023-01-11 14:17:48 发布

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最新推荐文章于 2023-01-11 14:17:48 发布

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本文介绍如何使用SQL Server进行数据表的创建及数据插入，并演示了如何通过XML PATH函数来组合同一GUID下的code值，最终形成路径字符串。

--创建表
if exists (select * from sysobjects where id = OBJECT_ID('[TempTable_Base]') and OBJECTPROPERTY(id, 'IsUserTable') = 1)
DROP TABLE [TempTable_Base]

CREATE TABLE [TempTable_Base] (
[id] [int]  IDENTITY (1, 1)  NOT NULL,
[guid] [varchar]  (50) NULL,
[code] [varchar]  (50) NULL)

SET IDENTITY_INSERT [TempTable_Base] ON

INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 1,'91E92DCB-141A-30B2-E6CD-B59EABD21749','A')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 2,'91E92DCB-141A-30B2-E6CD-B59EABD21749','C')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 3,'91E92DCB-141A-30B2-E6CD-B59EABD21749','E')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 4,'91E92DCB-141A-30B2-E6CD-B59EABD21749','O')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 5,'91E92DCB-141A-30B2-E6CD-B59EABD21749','G')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 6,'79DD7AB9-CE57-9431-B020-DF99731FC99D','A')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 7,'79DD7AB9-CE57-9431-B020-DF99731FC99D','O')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 8,'79DD7AB9-CE57-9431-B020-DF99731FC99D','E')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 9,'79DD7AB9-CE57-9431-B020-DF99731FC99D','F')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 10,'79DD7AB9-CE57-9431-B020-DF99731FC99D','O')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 11,'79DD7AB9-CE57-9431-B020-DF99731FC99D','B')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 12,'79DD7AB9-CE57-9431-B020-DF99731FC99D','D')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 13,'79DD7AB9-CE57-9431-B020-DF99731FC99D','F')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 14,'D61651D9-1B0A-0362-EE91-A805AA3E08F2','O')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 15,'D61651D9-1B0A-0362-EE91-A805AA3E08F2','D')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 16,'D61651D9-1B0A-0362-EE91-A805AA3E08F2','F')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 17,'D61651D9-1B0A-0362-EE91-A805AA3E08F2','C')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 18,'D61651D9-1B0A-0362-EE91-A805AA3E08F2','U')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 19,'D61651D9-1B0A-0362-EE91-A805AA3E08F2','F')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 20,'4802F0CD-B53F-A3F5-1C78-2D7424579C06','A')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 21,'3CCBFF9F-827B-6639-4780-DA7215166728','O')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 22,'3CCBFF9F-827B-6639-4780-DA7215166728','M')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 23,'3CCBFF9F-827B-6639-4780-DA7215166728','C')
INSERT [TempTable_Base] ([id],[guid],[code]) VALUES ( 24,'3CCBFF9F-827B-6639-4780-DA7215166728','M')

SET IDENTITY_INSERT [TempTable_Base] OFF

SELECT  B.guid,LEFT(UserList,LEN(UserList)-1) as paths FROM (
SELECT guid,
    (SELECT code+',' FROM TempTable_Base WHERE guid=A.guid ORDER BY ID FOR XML PATH('')) AS UserList
FROM TempTable_Base A
GROUP BY guid
) B