Question

我需要删除重复数据的帮助。

这是我的两个桌子。

1。 VL_Wohneinheiten

TABLE [dbo].[VL_Wohneinheiten](
[VLW_ID] [int] NOT NULL,
[VLW_Liegenschaft] [int] NOT NULL,
[VLW_FlatID] [nvarchar](25) NOT NULL,
[VLW_OTOID] [nvarchar](25) NOT                                           
[ID] [int] IDENTITY(1,1) NOT NULL,                                    
PRIMARY KEY CLUSTERED (
[VLW_ID] ASC)                                                            
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF,           
IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON)         
ON [PRIMARY]) ON [PRIMARY]                                                        
GO

2。 VL_Liegenschaften

TABLE [dbo].[VL_Liegenschaften](
[VLI_ID] [int] NOT NULL,
[VLI_Strasse] [nvarchar](100) NOT NULL,
[VLI_Nummer] [nvarchar](50) NOT NULL,
[VLI_PLZ] [nvarchar](10) NOT NULL,
[VLI_Ort] [nvarchar](100) NOT NULL,
[VLI_Import_flag] [tinyint] NOT NULL,
[VLI_OMDF_ID] [varchar](20) NULL, PRIMARY KEY CLUSTERED ( [VLI_ID] ASC)  
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF,           
IGNORE_DUP_KEY = OFF,ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON)          
ON [PRIMARY]) ON [PRIMARY]  GO

通过VL_Wohneinheiten.VLV_Liegenschaft = VL_Liegenschaften.VLI_ID完成这两个表之间的连接

我现在要删除所有由OTO_ID复制的数据，并且在表VL_Liegenschaften VLI_OMDF_ID中为NULL

在要查询的图像示例中，是否可以进行查询？

我已将图片设置为附加说明，但我只想更准确地说明我想做什么。

这是我尝试选择此信息的一个查询，我不确定该查询是否为真实查询，以防我该如何删除基于此显示的信息？

  select  t1.VLW_OTOID,  t2.VLI_OMDF_ID from VL_Wohneinheiten as t1     
  INNER JOIN VL_Liegenschaften as t2 ON t1.VLW_Liegenschaft = t2.VLI_ID 
  GROUP BY  t1.VLW_OTOID, t2.VLI_OMDF_ID HAVING COUNT(*) > 1              
  and t2.VLI_OMDF_ID IS NULL

非常感谢您的帮助。

INSERT [dbo].[VL_Wohneinheiten] ([VLW_ID], [VLW_Liegenschaft], [VLW_FlatID], [VLW_OTOID], [VLW_Koax], [VLW_Ready], [VLW_Fiber], [VLW_Status], [VLW_Status_text], [VLW_Import_flag], [VLW_Owner], [VLW_Caretaker], [VLW_Building_Type_id], [VLW_Building_Type], [ID]) VALUES (25822, 79045, N'', N'B.111.253.375.3', 0, N'                         ', 1, 0, N'Assigned', 1, NULL, NULL, NULL, NULL, 107184) INSERT [dbo].[VL_Wohneinheiten] ([VLW_ID], [VLW_Liegenschaft], [VLW_FlatID], [VLW_OTOID], [VLW_Koax], [VLW_Ready], [VLW_Fiber], [VLW_Status], [VLW_Status_text], [VLW_Import_flag], [VLW_Owner], [VLW_Caretaker], [VLW_Building_Type_id], [VLW_Building_Type], [ID]) VALUES (25823, 79046, N'', N'B.111.253.375.3', 0, N'                         ', 1, 0, N'Assigned', 1, NULL, NULL, NULL, NULL, 107185) INSERT [dbo].[VL_Wohneinheiten] ([VLW_ID], [VLW_Liegenschaft], [VLW_FlatID], [VLW_OTOID], [VLW_Koax], [VLW_Ready], [VLW_Fiber], [VLW_Status], [VLW_Status_text], [VLW_Import_flag], [VLW_Owner], [VLW_Caretaker], [VLW_Building_Type_id], [VLW_Building_Type], [ID]) VALUES (21638, 74861, N'', N'B.111.253.375.3', 0, N'                         ', 1, 0, N'Assigned', 1, NULL, NULL, NULL, NULL, 103000)INSERT [dbo].[VL_Wohneinheiten] ([VLW_ID], [VLW_Liegenschaft], [VLW_FlatID], [VLW_OTOID], [VLW_Koax], [VLW_Ready], [VLW_Fiber], [VLW_Status], [VLW_Status_text], [VLW_Import_flag], [VLW_Owner], [VLW_Caretaker], [VLW_Building_Type_id], [VLW_Building_Type], [ID]) VALUES (21639, 74862, N'', N'B.111.253.375.3', 0, N'                         ', 1, 0, N'Assigned', 1, NULL, NULL, NULL, NULL, 103001)

INSERT [dbo].[VL_Liegenschaften] ([VLI_ID], [VLI_Strasse], [VLI_Nummer], [VLI_PLZ], [VLI_Ort], [VLI_Import_flag], [VLI_OMDF_ID]) VALUES (74861, N'Zürcherstrasse', N'210', N'8500', N'Frauenfeld2', 0, NULL)
INSERT [dbo].[VL_Liegenschaften] ([VLI_ID], [VLI_Strasse], [VLI_Nummer], [VLI_PLZ], [VLI_Ort], [VLI_Import_flag], [VLI_OMDF_ID]) VALUES (74862, N'Zürcherstrasse', N'210', N'8500', N'Frauenfeld2', 0, NULL)
INSERT [dbo].[VL_Liegenschaften] ([VLI_ID], [VLI_Strasse], [VLI_Nummer], [VLI_PLZ], [VLI_Ort], [VLI_Import_flag], [VLI_OMDF_ID]) VALUES (79045, N'Zürcherstrasse', N'210A', N'8500', N'Frauenfeld2', 0, N'FRA_12')
INSERT [dbo].[VL_Liegenschaften] ([VLI_ID], [VLI_Strasse], [VLI_Nummer], [VLI_PLZ], [VLI_Ort], [VLI_Import_flag], [VLI_OMDF_ID]) VALUES (79046, N'Zürcherstrasse', N'210A', N'8500', N'Frauenfeld2', 0, N'FRA_12')

Answer 1

使用row_number（）

https://dbfiddle.uk/?rdbms=sqlserver_2016&fiddle=32f7806d19bbc5d77f369b1f200824e2

 select * from 
(select  t1.VLW_OTOID,  t2.VLI_OMDF_ID,row_number() over(partition by VLI_ID order by 
vli_id desc) as rn from VL_Wohneinheiten as t1     
INNER JOIN VL_Liegenschaften as t2 ON t1.VLW_Liegenschaft = t2.VLI_ID 
and t2.VLI_OMDF_ID IS NULL) a where rn=1

要删除重复的行：

delete w from [dbo].[VL_Liegenschaften] w
inner join 
(select  *,row_number() over(partition by VLW_OTOID order by 
VLW_Liegenschaft desc) as rn from VL_Wohneinheiten as t1     
INNER JOIN VL_Liegenschaften as t2 ON t1.VLW_Liegenschaft = t2.VLI_ID 
) a on a.[VLI_ID]=w.[VLI_ID] where rn<>1

使用INNER JOIN删除重复项

1 个答案: