以分组方式选择需要很长时间

我从表中选择时遇到问题。我运行下面的查询：以分组方式选择需要很长时间

DECLARE @FactId nvarchar (MAX) 

set @FactId = '2379233,2379237,2379244,2379246,2379249,2379250,2379254,2379255,2379257,2379260,2379262,2379264,2379266,2379268,2379270,2379276,2379279,2379284,2379285,2379293,2379294,2379298,2379300,2379305,2379308,2379310,2379313'; 

BEGIN 

SELECT 
    (apd.USS) as USS, (apd.Area) as Area, P.[Description] 
FROM 
    [gisoo].AdministrationPileDetail apd 
INNER JOIN 
    [gisoo].Locality L on L.LocalityId = apd.LocalityId 
INNER JOIN 
    [gisoo].Province P on P.CountryId = L.CountryId AND P.Provinceid = L.ProvinceId 
WHERE 
    apd.FactId IN (SELECT * FROM [gisoo].[ItemListToTable](@FactId)) 
    AND L.ProvinceId IS NOT NULL 
    AND L.DepartmentId IS NOT NULL 
END 
GO

此选择划分nvarchar（@FactId）入表中所有分离ID：

SELECT * 
FROM [gisoo].[ItemListToTable](@FactId)

查询有12000行，它需要两秒钟，但当我运行该组时，需要40秒。

DECLARE @FactId nvarchar (MAX) 

set @FactId = '2379233,2379237,2379244,2379246,2379249,2379250,2379254,2379255,2379257,2379260,2379262,2379264,2379266,2379268,2379270,2379276,2379279,2379284,2379285,2379293,2379294,2379298,2379300,2379305,2379308,2379310,2379313'; 

BEGIN 

SELECT 
    SUM(apd.USS) AS USS, 
    SUM(apd.Area) AS Area, 
    P.[Description] 
FROM 
    [gisoo].AdministrationPileDetail apd 
INNER JOIN 
    [gisoo].Locality L ON L.LocalityId = apd.LocalityId 
INNER JOIN 
    [gisoo].Province P ON P.CountryId = L.CountryId AND P.Provinceid = L.ProvinceId 
WHERE 
    apd.FactId IN (SELECT * FROM [gisoo].[ItemListToTable](@FactId)) 
    AND L.ProvinceId IS NOT NULL 
    AND L.DepartmentId IS NOT NULL 
GROUP BY 
    P.[Description] 
END 
GO

这两个表都没有索引。

我使用的是SQL Server 2008 R2和查询也有人在SQL Server 2012测试

来源

2015-10-01 Samuel Burgener

什么类型是描述列？你是否赞成查询计划？您是否尝试过索引说明列？ – Juan

描述char（30）null。我检查计划，并说我只能使用索引优化30％。我的查询时间很长。提取数据描述只有71行的表省。 –

最后，由应用程序完成组，响应只有3秒。在SQL查询内我没有发现我的问题 –

试试这个
而更换SELECT * FROM与特定的列名

set @FactId = '2379233,2379237,2379244,2379246,2379249,2379250,2379254,2379255,2379257,2379260,2379262,2379264,2379266,2379268,2379270,2379276,2379279,2379284,2379285,2379293,2379294,2379298,2379300,2379305,2379308,2379310,2379313'; 

BEGIN 

SELECT SUM(apd.USS) AS USS, 
     SUM(apd.Area) AS Area, 
     P.[Description] 
    FROM [gisoo].AdministrationPileDetail apd 
    JOIN [gisoo].Locality L 
     ON L.LocalityId = apd.LocalityId 
     AND L.DepartmentId IS NOT NULL 
     AND apd.FactId IN (SELECT * FROM [gisoo].[ItemListToTable] (@FactId))   
    JOIN [gisoo].Province P 
     ON P.CountryId = L.CountryId 
     AND P.Provinceid = L.ProvinceId   
GROUP BY P.[Description] 
END 
GO

来源

2015-10-01 17:15:04 Paparazzi

咨询仍在同一时间全选，因为该表只有一列。 –

使用列名称仍然是一个好习惯。并且查询还有其他更改。如果描述是唯一的，请在P [Description]上尝试索引，或者更好地在该表上使用PK。 – Paparazzi

关注评论？问题出在哪里？ – Paparazzi

对于您查询，您应该索引如下：

CREATE INDEX IX_AdministrationPileDetail_LocalityId ON AdministrationPileDetail (LocalityID) 
CREATE INDEX IX_AdministrationPileDetail_FactId ON AdministrationPileDetail (FactId) 

CREATE INDEX IX_Locality_CountryId ON Locality(CountryId) 
CREATE INDEX IX_Locality_ProvinceId ON Locality(ProvinceId) 
CREATE INDEX IX_Locality_DepartmentId ON Locality(DepartmentId)

这是您的FK基本的索引，也就是做最好的做法。

然后，如果你仍然有问题，你可以考虑创建在列的索引你被分组：

CREATE INDEX IX_Province_Description ON Province(Description)

您可能需要外部的移动功能，并创建一个态表了它，而不是让它在WHERE上调用。

SELECT 
    * 
INTO 
    #Items 
FROM 
    [gisoo].[ItemListToTable](@FactId) 

CREATE IX_Items_FactId ON #Items(FactId) 

SELECT 
    (apd.USS) as USS, (apd.Area) as Area, P.[Description] 
FROM 
    [gisoo].AdministrationPileDetail apd 
INNER JOIN 
    [gisoo].Locality L on L.LocalityId = apd.LocalityId 
INNER JOIN 
    [gisoo].Province P on P.CountryId = L.CountryId AND P.Provinceid = L.ProvinceId 
INNER JOIN 
    #Items i ON apd.FactId = i.FactId 
WHERE 
    apd.FactId IN (SELECT * FROM [gisoo].[ItemListToTable](@FactId)) 
    AND L.ProvinceId IS NOT NULL 
    AND L.DepartmentId IS NOT NULL

来源

2015-10-01 17:15:38 Juan

以分组方式选择需要很长时间

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