Question

我有4张桌子：

主表Applications带有以下示例数据：

Id | Craft_Name | Area     | PPE       | Potential
---+------------+----------+-----------+-------------
 1 | anas       | 1, 2, 3, | 4, 1, 3,  | 4, 2,

第二张表Area：

Id | Area
---+----------
 1 | Jordan
 2 | USA
 3 | China

第三张桌子PPE

Id | PPE 
---+-----------------
 1 | Safety Shoes   
 2 | Safety Gloves  
 3 | Electrical Gloves
 4 | Thermal Gloves

第四张表Potential：

ID | Potential
---+----------------------
 1 | Working at Height
 2 | Falling Objects
 3 | Sharp Edges
 4 | Inhalation

最后，我需要如下所示的SQL查询结果：

Id | Craft_Name | Area                | PPE                                                   | Potential
---+------------+---------------------+-------------------------------------------------------+-----------------------------
 1 | anas       | Jordan, USA, China, | Thermal Gloves, Working at Height, Electrical Gloves, | Inhalation, Falling Objects,

Answer 1

您可以通过两种方式进行操作。

更改您的应用程序表结构以包括新的3个多对多关系表。（推荐，并且更容易进行任何类型的分析）

，或者您可以使用以下代码，它非常复杂，并且其中包含许多复杂的查询。

IF OBJECT_ID('tempdb..#AreaTable') IS NOT NULL
    DROP TABLE #AreaTable
IF OBJECT_ID('tempdb..#PPETable') IS NOT NULL
    DROP TABLE #PPETable

; WITH AreaTable AS (
    SELECT 
        A.ID, A.CreaftName, AreaName
    FROM  
        (
            SELECT T1.ID, T1.CreaftName,T1.[AreaIDs],T2.my_Splits
            FROM
                (
                    SELECT *,
                        CAST('<X>'+replace([AreaIDs],',','</X><X>')+'</X>' as XML) as my_Xml 
                    FROM [dbo].[Applications]) T1
                    CROSS APPLY
                    (
                        SELECT 
                            my_Data.D.value('.','varchar(50)') as my_Splits
                        FROM 
                            T1.my_Xml.nodes('X') as my_Data(D)
                    ) T2
                ) A 
    INNER JOIN [dbo].[Areas] B on A.my_splits = B.ID
)

--SELECT * FROM TempTable

SELECT DISTINCT ST2.ID, St2.CreaftName,
    SUBSTRING(
        (
            SELECT ','+ ST1.AreaName  AS [text()]
            FROM AreaTable ST1
            WHERE ST1.ID = ST2.ID
            ORDER BY ST1.ID
            FOR XML PATH ('')
        ), 2, 1000) [Areas]
INTO #AreaTable
FROM [dbo].[Applications] ST2

;WITH PPETable AS (
    SELECT 
        A.ID, A.CreaftName, PPEName
    FROM  
        (
            SELECT T1.ID, T1.CreaftName,T1.PPEIDs,T2.my_Splits
            FROM
                (
                    SELECT *,
                        CAST('<X>'+replace(PPEIDs,',','</X><X>')+'</X>' as XML) as my_Xml 
                    FROM [dbo].[Applications]) T1
                    CROSS APPLY
                    (
                        SELECT 
                            my_Data.D.value('.','varchar(50)') as my_Splits
                        FROM 
                            T1.my_Xml.nodes('X') as my_Data(D)
                    ) T2
                ) A 
    INNER JOIN [dbo].[PPE] B on A.my_splits = B.ID
)

--SELECT * FROM TempTable

SELECT DISTINCT ST2.ID, St2.CreaftName,
    SUBSTRING(
        (
            SELECT ','+ ST1.PPEName  AS [text()]
            FROM PPETable ST1
            WHERE ST1.ID = ST2.ID
            ORDER BY ST1.ID
            FOR XML PATH ('')
        ), 2, 1000) [PPEs]
INTO #PPETable
FROM [dbo].[Applications] ST2

SELECT MainTable.ID, MainTable.CreaftName, A.Areas, B.[PPEs]
FROM 
    [dbo].[Applications] AS MainTable
    LEFT OUTER JOIN #AreaTable AS A ON MainTable.ID = A.ID
    LEFT OUTER JOIN #PPETable AS B ON MainTable.ID = B.ID


IF OBJECT_ID('tempdb..#AreaTable') IS NOT NULL
    DROP TABLE #AreaTable
IF OBJECT_ID('tempdb..#PPETable') IS NOT NULL
    DROP TABLE #PPETable

您可以使用以下代码生成我创建此脚本时所用的表，以供您参考

    IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[PPE]') AND type in (N'U'))
    DROP TABLE [dbo].[PPE]
    GO
    /****** Object:  Table [dbo].[Areas]    Script Date: 23/12/2018 10:43:40 AM ******/
    IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Areas]') AND type in (N'U'))
    DROP TABLE [dbo].[Areas]
    GO
    /****** Object:  Table [dbo].[Applications]    Script Date: 23/12/2018 10:43:40 AM ******/
    IF  EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Applications]') AND type in (N'U'))
    DROP TABLE [dbo].[Applications]
    GO
    /****** Object:  Table [dbo].[Applications]    Script Date: 23/12/2018 10:43:40 AM ******/
    SET ANSI_NULLS ON
    GO
    SET QUOTED_IDENTIFIER ON
    GO
    IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Applications]') AND type in (N'U'))
    BEGIN
    CREATE TABLE [dbo].[Applications](
        [ID] [int] IDENTITY(1,1) NOT NULL,
        [CreaftName] [nvarchar](50) NULL,
        [AreaIDs] [nvarchar](50) NULL,
        [PPEIDs] [nvarchar](50) NULL,
        CONSTRAINT [PK_Applications] PRIMARY KEY CLUSTERED 
    (
        [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]
    END
    GO
    /****** Object:  Table [dbo].[Areas]    Script Date: 23/12/2018 10:43:40 AM ******/
    SET ANSI_NULLS ON
    GO
    SET QUOTED_IDENTIFIER ON
    GO
    IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[Areas]') AND type in (N'U'))
    BEGIN
    CREATE TABLE [dbo].[Areas](
        [ID] [int] IDENTITY(1,1) NOT NULL,
        [AreaName] [nvarchar](50) NULL,
        CONSTRAINT [PK_Ares] PRIMARY KEY CLUSTERED 
    (
        [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]
    END
    GO
    /****** Object:  Table [dbo].[PPE]    Script Date: 23/12/2018 10:43:40 AM ******/
    SET ANSI_NULLS ON
    GO
    SET QUOTED_IDENTIFIER ON
    GO
    IF NOT EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[PPE]') AND type in (N'U'))
    BEGIN
    CREATE TABLE [dbo].[PPE](
        [ID] [int] IDENTITY(1,1) NOT NULL,
        [PPEName] [nvarchar](50) NULL,
        CONSTRAINT [PK_PPE] PRIMARY KEY CLUSTERED 
    (
        [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]
    END
    GO
    SET IDENTITY_INSERT [dbo].[Applications] ON 

    INSERT [dbo].[Applications] ([ID], [CreaftName], [AreaIDs], [PPEIDs]) VALUES (1, N'Anas', N'1,3,2,', N'1,3')
    INSERT [dbo].[Applications] ([ID], [CreaftName], [AreaIDs], [PPEIDs]) VALUES (2, N'Islam', N',6,5,3', N'2')
    INSERT [dbo].[Applications] ([ID], [CreaftName], [AreaIDs], [PPEIDs]) VALUES (3, N'Mohammad', N'4', NULL)
    SET IDENTITY_INSERT [dbo].[Applications] OFF
    SET IDENTITY_INSERT [dbo].[Areas] ON 

    INSERT [dbo].[Areas] ([ID], [AreaName]) VALUES (1, N'Jordan')
    INSERT [dbo].[Areas] ([ID], [AreaName]) VALUES (2, N'China')
    INSERT [dbo].[Areas] ([ID], [AreaName]) VALUES (3, N'USA')
    INSERT [dbo].[Areas] ([ID], [AreaName]) VALUES (4, N'Colombia')
    INSERT [dbo].[Areas] ([ID], [AreaName]) VALUES (5, N'Costa Rica')
    INSERT [dbo].[Areas] ([ID], [AreaName]) VALUES (6, N'Panama')
    SET IDENTITY_INSERT [dbo].[Areas] OFF
    SET IDENTITY_INSERT [dbo].[PPE] ON 

    INSERT [dbo].[PPE] ([ID], [PPEName]) VALUES (1, N'Safety Shoes')
    INSERT [dbo].[PPE] ([ID], [PPEName]) VALUES (2, N'Safety Gloves')
    INSERT [dbo].[PPE] ([ID], [PPEName]) VALUES (3, N'Electrical Gloves')
    SET IDENTITY_INSERT [dbo].[PPE] OFF

Answer 2

例如-面积表（继续其他表）

select 
    (select Area.Area + ',' 
     from dbo.Area 
     where charindex(',' + cast(Area.Id as varchar(10)) + ',', ',' + isnull(Applications.Area, '') + ',') > 0 
     for xml path('')) 
from 
    dbo.Applications

相同记录sql中的多值

2 个答案: