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我有两个简单的查询，它们单独运行时会在预期时间内执行。第一个查询：

SELECT OBJECTID AS OID FROM PST_35053_SNAPPED;

花费不到一秒的时间并返回大约 3000 行。第二个查询：

SELECT DISTINCT PST.OBJECTID as OID FROM PST_35053_SNAPPED 
PST INNER JOIN  POWNERS_35053 POW
ON geometry::STGeomFromText('POINT(' + convert(varchar(16),POW.x) + ' ' +
convert(varchar(17),POW.y) + ')', 2100).STWithin(PST.Shape)=1;

需要一秒钟才能返回大约 2500 行。

当将它们与不包含点的情况下EXCEPT检索polygon IDs时（大约 500 行），生成的查询需要两分钟以上的时间来执行（大约 122 秒）：

SELECT OBJECTID AS OID FROM PST_35053_SNAPPED
EXCEPT
SELECT DISTINCT PST.OBJECTID as OID FROM PST_35053_SNAPPED 
PST INNER JOIN  POWNERS_35053 POW
ON geometry::STGeomFromText('POINT(' + convert(varchar(16),POW.x) + ' ' +
convert(varchar(17),POW.y) + ')', 2100).STWithin(PST.Shape)=1

我有什么遗漏或做错了吗？我正在使用SQL Server 2012 SP3

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2 回答 2

1

尝试将您的脚本插入临时表而不是合并它。我们没有执行计划，我们只能向您展示以不同的角度执行您的查询。：

SELECT DISTINCT PST.OBJECTID as OID INTO #Temp FROM PST_35053_SNAPPED 
PST INNER JOIN  POWNERS_35053 POW
ON geometry::STGeomFromText('POINT(' + convert(varchar(16),POW.x) + ' ' +
convert(varchar(17),POW.y) + ')', 2100).STWithin(PST.Shape)=1;

SELECT OBJECTID AS OID FROM PST_35053_SNAPPED
EXCEPT
SELECT OID FROM #Temp;

或尝试不存在：

SELECT OBJECTID AS OID 
FROM PST_35053_SNAPPED PST1
WHERE NOT EXISTS 
    (SELECT 1 FROM 
        (
            SELECT DISTINCT PST.OBJECTID as OID FROM PST_35053_SNAPPED 
            PST INNER JOIN  POWNERS_35053 POW
            ON geometry::STGeomFromText('POINT(' + convert(varchar(16),POW.x) + ' ' +
            convert(varchar(17),POW.y) + ')', 2100).STWithin(PST.Shape)=1
        ) PST2
        WHERE PST1.OBJECTID=PST2.OBJECTID
    )

或尝试使用：

WITH Cte AS 
(
    SELECT DISTINCT PST.OBJECTID as OID FROM PST_35053_SNAPPED 
    PST INNER JOIN  POWNERS_35053 POW
    ON geometry::STGeomFromText('POINT(' + convert(varchar(16),POW.x) + ' ' +
    convert(varchar(17),POW.y) + ')', 2100).STWithin(PST.Shape)=1
)
SELECT OBJECTID AS OID FROM PST_35053_SNAPPED
EXCEPT
SELECT OID FROM Cte;
于 2018-11-16T14:56:35.027 回答
0

没有查询执行计划很难说。但是，如果我理解正确，以下查询应该会得到相同的结果，并且会更快。

SELECT PST.OBJECTID as OID 
FROM PST_35053_SNAPPED PST 
LEFT JOIN  POWNERS_35053 POW
ON geometry::STGeomFromText('POINT(' + convert(varchar(16),POW.x) + ' ' +
convert(varchar(17),POW.y) + ')', 2100).STWithin(PST.Shape)=1
WHERE POW.OBJECTID IS NULL
于 2018-11-16T14:16:52.107 回答