~14M 行のテーブルから 2158 行の ID を返すかなり複雑な SQL があります。簡単にするためにCTEを使用しています。
はWHERE
2 つの条件で構成されます。それらの1つをコメントアウトすると、もう1つは〜2秒で実行されます。両方を ( で区切ってOR
) そのままにしておくと、クエリは約 100 秒実行されます。最初の条件だけで 1 ~ 2 秒かかり、19 行が返されます。2 番目の条件だけでは 0 秒かかり、2139 行が返されます。
その理由は何ですか?
これは完全な SQL です。
WITH fpcRepairs AS
(
SELECT FPC_Row = ROW_NUMBER()OVER(PARTITION BY t.SSN_Number ORDER BY t.Received_Date, t.Claim_Creation_Date, t.Repair_Completion_Date, t.Claim_Submitted_Date)
, idData, Repair_Completion_Date, Received_Date, Work_Order, SSN_number, fiMaxActionCode, idModel,ModelName
, SP=(SELECT TOP 1 Reused_Indicator FROM tabDataDetail td INNER JOIN tabSparePart sp ON td.fiSparePart=sp.idSparePart
WHERE td.fiData=t.idData
AND (td.Material_Quantity <> 0)
AND (sp.SparePartName = '1254-3751'))
FROM tabData AS t INNER JOIN
modModel AS m ON t.fiModel = m.idModel
WHERE (m.ModelName = 'LT26i')
AND EXISTS(
SELECT NULL
FROM tabDataDetail AS td
INNER JOIN tabSparePart AS sp ON td.fiSparePart = sp.idSparePart
WHERE (td.fiData = t.idData)
AND (td.Material_Quantity <> 0)
AND (sp.SparePartName = '1254-3751')
)
), needToChange AS
(
SELECT idData FROM tabData AS t INNER JOIN
modModel AS m ON t.fiModel = m.idModel
WHERE (m.ModelName = 'LT26i')
AND EXISTS(
SELECT NULL
FROM tabDataDetail AS td
INNER JOIN tabSparePart AS sp ON td.fiSparePart = sp.idSparePart
WHERE (td.fiData = t.idData)
AND (td.Material_Quantity <> 0)
AND (sp.SparePartName IN ('1257-2741','1257-2742','1248-2338','1254-7035','1248-2345','1254-7042'))
)
)
SELECT t.idData
FROM tabData AS t INNER JOIN modModel AS m ON t.fiModel = m.idModel
INNER JOIN needToChange ON t.idData = needToChange.idData -- needs to change FpcAssy
LEFT OUTER JOIN fpcRepairs rep ON t.idData = rep.idData
WHERE
rep.idData IS NOT NULL -- FpcAssy replaced, check if reused was claimed correctly
AND rep.FPC_Row > 1 -- other FpcAssy repair before
AND (
SELECT SP FROM fpcRepairs lastRep
WHERE lastRep.SSN_Number = rep.SSN_Number
AND lastRep.FPC_Row = rep.FPC_Row - 1
) = rep.SP -- same SP, must be rejected(reused+reused or new+new)
OR
rep.idData IS NOT NULL -- FpcAssy replaced, check if reused was claimed correctly
AND rep.FPC_Row = 1 -- no other FpcAssy repair before
AND rep.SP = 0 -- not reused, must be rejected
order by t.idData
実行計画は次のとおりです。