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我在 SQL Server 2014 上工作，在显示以 $ 分隔的功能名称和功能值后出现问题。

在添加特征名称和特征值后执行下面的查询stuff时变得非常慢。

如何增强它？

在添加这两个stuff语句之前，需要 28 秒才能显示 75 万条记录。现在如下脚本，添加两个stuff语句后需要 5 分钟。

下面的脚本给了我预期的结果，但问题是性能非常慢。

那么我可以分开功能名称和功能值以使其更快吗？如果可能，用 $ 分隔。

我的脚本：

IF OBJECT_ID('[dbo].[gen]') IS NOT NULL
    DROP TABLE [dbo].[gen]    

IF OBJECT_ID('[dbo].[PartAttributes]') IS NOT NULL
    DROP TABLE [dbo].[PartAttributes]    

IF OBJECT_ID('dbo.core_datadefinition_Detailes') IS NOT NULL
    DROP TABLE core_datadefinition_Detailes
    
CREATE TABLE core_datadefinition_Detailes
(
     [ID] [int] IDENTITY(1,1) NOT FOR REPLICATION NOT NULL,
     [ColumnName] [nvarchar](500) NOT NULL,
     [ColumnNumber] [int] NOT NULL,
        
     CONSTRAINT [PK_Core_DataDefinition_Details] 
         PRIMARY KEY CLUSTERED ([ID] ASC)
)

INSERT INTO core_datadefinition_Detailes([ColumnNumber],[ColumnName])
VALUES (202503, 'Product Shape Type'),
       (1501170111, 'Type'),
       (202504, 'Package Family')
    
    
CREATE TABLE [dbo].[gen]
(
     [TradeCodeControlID] [int] IDENTITY(1,1) NOT NULL,
     [CodeTypeID] [int] NULL,
     [RevisionID] [bigint] NULL,
     [Code] [varchar](20) NULL,
     [ZPLID] [int] NULL,
     [ZfeatureKey] [bigint] NULL,
) ON [PRIMARY]
GO

SET IDENTITY_INSERT [dbo].[gen] ON 

INSERT INTO [dbo].[gen] ([TradeCodeControlID], [CodeTypeID],[RevisionID], [Code], [ZPLID], [ZfeatureKey]) 
VALUES (7565, 849774, 307683692, N'8541100050', 4239, 202503)

INSERT INTO [dbo].[gen] ([TradeCodeControlID], [CodeTypeID],[RevisionID], [Code], [ZPLID], [ZfeatureKey]) 
VALUES (7566, 849774, 307683692, N'8541100050', 4239, 202504)

INSERT INTO [dbo].[gen] ([TradeCodeControlID], [CodeTypeID],[RevisionID], [Code], [ZPLID], [ZfeatureKey]) 
VALUES (7567, 849774, 307683692, N'8541100050', 4239, 1501170111)
    
SET IDENTITY_INSERT [dbo].[gen] OFF
    
CREATE TABLE [dbo].[PartAttributes]
(
     [PartID] [int] NOT NULL,
     [ZfeatureKey] [bigint] NULL,
     [AcceptedValuesOption_Value] [float] NULL,
     [FeatureValue] [nvarchar](500) NOT NULL
) ON [PRIMARY]
GO

INSERT INTO [dbo].[PartAttributes] ([PartID], [ZfeatureKey],  [FeatureValue]) 
VALUES (413989, 202503, N'Discrete')

INSERT INTO [dbo].[PartAttributes] ([PartID], [ZfeatureKey],  [FeatureValue]) 
VALUES (413989, 1501170111, N'Zener')

INSERT INTO [dbo].[PartAttributes] ([PartID], [ZfeatureKey],  [FeatureValue]) 
VALUES (413989, 202504, N'SOT')
    
SELECT  
    PartID, Code, Co.CodeTypeID, Co.RevisionID, Co.ZPLID,
    COUNT(1) AS ConCount,
    STUFF((SELECT '$' + CAST(CP.ColumnName AS VARCHAR(300)) AS [text()]
           FROM
               (SELECT DISTINCT
                    d.ColumnName, C.codeTypeId, C.Code, C.ZfeatureKey 
                FROM gen C 
                INNER JOIN core_datadefinitiondetails d WITH (NOLOCK) ON C.ZfeatureKey = d.columnnumber
                INNER JOIN PartAttributes P ON P.partid = PM.partid) CP
           WHERE CP.codeTypeId = Co.codeTypeId AND CP.Code = Co.Code
           ORDER BY CP.ZfeatureKey
           FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1,  1, '') AS FeatureName,
    STUFF((SELECT '$' + CAST(CP2.FeatureValue AS VARCHAR(300)) AS [text()]
           FROM
               (SELECT DISTINCT
                    P.FeatureValue, C2.codeTypeId, C2.Code, C2.ZfeatureKey 
                FROM gen C2
                INNER JOIN PartAttributes P ON C2.ZfeatureKey = P.ZfeatureKey) CP2
           WHERE CP2.codeTypeId = Co.codeTypeId AND CP2.Code = Co.Code
           ORDER BY CP2.ZfeatureKey
           FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1,  1, '') AS FeatureValue
FROM 
    PartAttributes PM 
INNER JOIN    
    gen Co ON Co.ZfeatureKey = PM.ZfeatureKey
GROUP BY
    PartID, Code, Co.CodeTypeID, Co.RevisionID, Co.ZPLID

最后结果：

添加两个东西后的最终结果

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