这是我的查询
select t.accountno from tenant_info t where
(
select sum(d.Bill_Amount) from billing_summary s , Billing_Detail d
where s.Id=d.Billing_Summary_ID and s.id in
(select top 2 Id from Billing_Summary where Tenant_Info_ID = t.TenantId
order by bill_date desc)
) = 0
表中的记录数以百万计，这也就是为什么这个查询给出的结果是3分钟，然后应用程序超时。我认为第三个子查询需要写得更好但不能提出任何解决方案
有没有更好的解决方案？
答案 0 :(得分：0)
来自@Mustafa的上述查询SQL语句显然更优雅，但这表现得更快。
设置测试数据：
--/*
SET NOCOUNT ON
IF OBJECT_ID('Tenant_Info', 'U') IS NOT NULL DROP TABLE Tenant_Info;
GO
CREATE TABLE dbo.Tenant_Info (
TenantId int IDENTITY(1, 1)
,AccountNo varchar(10)
)
GO
IF OBJECT_ID('Billing_Summary', 'U') IS NOT NULL DROP TABLE Billing_Summary;
GO
CREATE TABLE dbo.Billing_Summary (
Id int IDENTITY(1, 1)
,Tenant_Info_ID int
,Bill_Date date
)
GO
IF OBJECT_ID('Billing_Detail', 'U') IS NOT NULL DROP TABLE Billing_Detail;
GO
CREATE TABLE dbo.Billing_Detail (
Id int IDENTITY(1, 1)
,Billing_Summary_ID int
,Bill_Amount decimal(28, 10)
)
GO
-- ====================================================================
-- CREATE THE Tenant_Info TEST DATA
-- Turn 1 row into 1,048,576
INSERT Tenant_Info (AccountNo) SELECT ''
DECLARE @Count int; SELECT @Count = 0;
WHILE @Count < 20 -- 20: 1,048,576 10: 1,024
BEGIN
INSERT Tenant_Info (AccountNo)
SELECT AccountNo FROM Tenant_Info
SELECT @Count = (@Count + 1)
END
UPDATE TI SET TI.AccountNo = CONVERT(varchar(10), (1000000000 + TI.TenantId))
-- SELECT COUNT(*)
FROM Tenant_Info TI
CREATE NONCLUSTERED INDEX idx_Tenant_Info ON Tenant_Info (TenantId);
-- ====================================================================
-- ====================================================================
-- CREATE THE Billing_Summary TEST DATA (12 MONTHS FOR EACH TENANT)
DECLARE @Count2 int; SELECT @Count2 = 0;
WHILE @Count2 < 12
BEGIN
INSERT Billing_Summary (Tenant_Info_ID, Bill_Date)
SELECT 1, DATEADD(MONTH, @Count2, '08/01/2012')
SELECT @Count2 = (@Count2 + 1)
END
-- Ensure that the Max Bill Date has the lowest Billing_Summary Id to
-- avoid the assumption that the Ids are in order
DECLARE @MaxBillDate date;
SELECT @MaxBillDate = MAX(Bill_Date) FROM Billing_Summary
INSERT Billing_Summary (Tenant_Info_ID, Bill_Date)
SELECT TI.TenantId, BS.Bill_Date
FROM Tenant_Info TI
CROSS JOIN Billing_Summary BS
WHERE TI.TenantId <> 1
AND BS.Bill_Date = @MaxBillDate
INSERT Billing_Summary (Tenant_Info_ID, Bill_Date)
SELECT TI.TenantId, BS.Bill_Date
FROM Tenant_Info TI
CROSS JOIN Billing_Summary BS
WHERE TI.TenantId <> 1
AND BS.Bill_Date <> @MaxBillDate
CREATE NONCLUSTERED INDEX idx_Billing_Summary_1 ON Billing_Summary (Id, Tenant_Info_ID);
CREATE NONCLUSTERED INDEX idx_Billing_Summary_2 ON Billing_Summary (Tenant_Info_ID, Bill_Date);
--SELECT COUNT(*) FROM Billing_Summary
--SELECT COUNT(DISTINCT Tenant_Info_ID) FROM Billing_Summary
--SELECT COUNT(DISTINCT Bill_Date) FROM Billing_Summary
--SELECT * FROM Billing_Summary WHERE Tenant_Info_ID = 1
-- ====================================================================
-- ====================================================================
-- CREATE THE Billing_Detail TEST DATA (2 LINES FOR EACH SUMMARY)
INSERT Billing_Detail (Billing_Summary_ID, Bill_Amount)
SELECT BS.Id, BS.Tenant_Info_ID as [Bill_Amount]
FROM Billing_Summary BS
INSERT Billing_Detail (Billing_Summary_ID, Bill_Amount)
SELECT BS.Id, BS.Tenant_Info_ID as [Bill_Amount]
FROM Billing_Summary BS
DECLARE @MaxBillDateB date, @2ndMaxBillDateB date;
SELECT @MaxBillDateB = MAX(Bill_Date) FROM Billing_Summary
SELECT @2ndMaxBillDateB = MAX(Bill_Date) FROM Billing_Summary WHERE Bill_Date <> @MaxBillDateB
UPDATE BD SET BD.Bill_Amount = 0
FROM Billing_Detail BD
JOIN Billing_Summary BS
ON BD.Billing_Summary_ID = BS.Id
JOIN (
SELECT TOP 50 PERCENT A.*
FROM (
SELECT DISTINCT BS.Tenant_Info_ID
FROM Billing_Detail BD
JOIN Billing_Summary BS
ON BD.Billing_Summary_ID = BS.Id
) A
ORDER BY NEWID()
) B
ON BS.Tenant_Info_ID = B.Tenant_Info_ID
AND BS.Bill_Date IN (@2ndMaxBillDateB, @MaxBillDateB)
CREATE NONCLUSTERED INDEX idx_Billing_Detail_1 ON Billing_Detail (Id);
CREATE NONCLUSTERED INDEX idx_Billing_Detail_2 ON Billing_Detail (Billing_Summary_ID);
-- SELECT BS.Tenant_Info_ID, SUM(BD.Bill_Amount) FROM Billing_Detail BD JOIN Billing_Summary BS ON BD.Billing_Summary_ID = BS.Id WHERE BD.Bill_Amount = 0 GROUP BY BS.Tenant_Info_ID
-- ====================================================================
SET NOCOUNT OFF
--*/
运行查询脚本：
/*
-- ORIGINAL QUERY TAKING 3 MINUTES BY THE QUESTION ASKER
SELECT COUNT(*) -- On my system this runs in about ~25 seconds for a 524,288 row result
FROM (
select t.accountno from tenant_info t where
(
select sum(d.Bill_Amount) from billing_summary s , Billing_Detail d
where s.Id=d.Billing_Summary_ID and s.id in
(select top 2 Id from Billing_Summary where Tenant_Info_ID = t.TenantId
order by bill_date desc)
) = 0
) A
--*/
-- Start off getting the max bill date for each tenant
IF OBJECT_ID('tempdb..#Tenant_MaxBillDate', 'U') IS NOT NULL DROP TABLE #Tenant_MaxBillDate;
CREATE TABLE #Tenant_MaxBillDate (Tenant_Info_ID int, Bill_Date date);
INSERT #Tenant_MaxBillDate (Tenant_Info_ID, Bill_Date)
SELECT BS.Tenant_Info_ID, MAX(BS.Bill_Date)
FROM Billing_Summary BS
GROUP BY BS.Tenant_Info_ID
CREATE NONCLUSTERED INDEX idx_#Tenant_MaxBillDate ON #Tenant_MaxBillDate (Tenant_Info_ID, Bill_Date);
-- Additionally, get the 2nd latest bill date for each tenant
IF OBJECT_ID('tempdb..#Tenant_2ndToMaxBillDate', 'U') IS NOT NULL DROP TABLE #Tenant_2ndToMaxBillDate;
CREATE TABLE #Tenant_2ndToMaxBillDate (Tenant_Info_ID int, Bill_Date date);
INSERT #Tenant_2ndToMaxBillDate (Tenant_Info_ID, Bill_Date)
SELECT BS.Tenant_Info_ID, MAX(BS.Bill_Date)
FROM Billing_Summary BS
LEFT JOIN #Tenant_MaxBillDate TM
ON BS.Tenant_Info_ID = TM.Tenant_Info_ID
AND BS.Bill_Date = TM.Bill_Date
WHERE TM.Tenant_Info_ID IS NULL
GROUP BY BS.Tenant_Info_ID
CREATE NONCLUSTERED INDEX idx_#Tenant_2ndToMaxBillDate ON #Tenant_2ndToMaxBillDate (Tenant_Info_ID, Bill_Date);
-- This is necessary to avoid an incorrect assumpttion that the max summary id also has the latest bill date
IF OBJECT_ID('tempdb..#Tenant_MaxBillSummary', 'U') IS NOT NULL DROP TABLE #Tenant_MaxBillSummary;
CREATE TABLE #Tenant_MaxBillSummary (Tenant_Info_ID int, Billing_Summary_ID int);
INSERT #Tenant_MaxBillSummary (Tenant_Info_ID, Billing_Summary_ID)
SELECT BS.Tenant_Info_ID, MAX(BS.Id)
FROM Billing_Summary BS
JOIN #Tenant_MaxBillDate TM
ON BS.Tenant_Info_ID = TM.Tenant_Info_ID
AND BS.Bill_Date = TM.Bill_Date
GROUP BY BS.Tenant_Info_ID
CREATE NONCLUSTERED INDEX idx_#Tenant_MaxBillSummary ON #Tenant_MaxBillSummary (Tenant_Info_ID, Billing_Summary_ID);
-- This is necessary in case the 2nd max summary id is also on the latest bill date
IF OBJECT_ID('tempdb..#Tenant_2ndToMaxBillSummary_SameDate', 'U') IS NOT NULL DROP TABLE #Tenant_2ndToMaxBillSummary_SameDate;
CREATE TABLE #Tenant_2ndToMaxBillSummary_SameDate (Tenant_Info_ID int, Billing_Summary_ID int);
INSERT #Tenant_2ndToMaxBillSummary_SameDate (Tenant_Info_ID, Billing_Summary_ID)
SELECT BS.Tenant_Info_ID, MAX(BS.Id)
FROM Billing_Summary BS
JOIN #Tenant_MaxBillDate TM
ON BS.Tenant_Info_ID = TM.Tenant_Info_ID
AND BS.Bill_Date = TM.Bill_Date
LEFT JOIN #Tenant_MaxBillSummary TMM
ON BS.Id = TMM.Billing_Summary_ID
AND BS.Tenant_Info_ID = TMM.Tenant_Info_ID
WHERE TMM.Billing_Summary_ID IS NULL
GROUP BY BS.Tenant_Info_ID
CREATE NONCLUSTERED INDEX idx_#Tenant_2ndToMaxBillSummary_SameDate ON #Tenant_2ndToMaxBillSummary_SameDate (Tenant_Info_ID, Billing_Summary_ID);
-- This will probably get the majority of cases where the 2nd max summary id is on the 2nd latest bill date
IF OBJECT_ID('tempdb..#Tenant_2ndToMaxBillSummary_2ndDate', 'U') IS NOT NULL DROP TABLE #Tenant_2ndToMaxBillSummary_2ndDate;
CREATE TABLE #Tenant_2ndToMaxBillSummary_2ndDate (Tenant_Info_ID int, Billing_Summary_ID int);
INSERT #Tenant_2ndToMaxBillSummary_2ndDate (Tenant_Info_ID, Billing_Summary_ID)
SELECT BS.Tenant_Info_ID, MAX(BS.Id)
FROM Billing_Summary BS
JOIN #Tenant_2ndToMaxBillDate TM
ON BS.Tenant_Info_ID = TM.Tenant_Info_ID
AND BS.Bill_Date = TM.Bill_Date
LEFT JOIN #Tenant_MaxBillSummary TMS
ON BS.Id = TMS.Billing_Summary_ID
LEFT JOIN #Tenant_2ndToMaxBillSummary_SameDate TMS2
ON BS.Tenant_Info_ID = TMS2.Tenant_Info_ID
WHERE 1=1
AND TMS.Billing_Summary_ID IS NULL -- Do not choose the same summary ID
AND TMS2.Tenant_Info_ID IS NULL -- Do not choose a tenant that has to summary entries for their max date
GROUP BY BS.Tenant_Info_ID
CREATE NONCLUSTERED INDEX idx_#Tenant_2ndToMaxBillSummary_2ndDate ON #Tenant_2ndToMaxBillSummary_2ndDate (Tenant_Info_ID, Billing_Summary_ID);
IF OBJECT_ID('tempdb..#Tenant_Top2BillSummaryRecords', 'U') IS NOT NULL DROP TABLE #Tenant_Top2BillSummaryRecords;
CREATE TABLE #Tenant_Top2BillSummaryRecords (Tenant_Info_ID int, Billing_Summary_ID int);
INSERT #Tenant_Top2BillSummaryRecords (Tenant_Info_ID, Billing_Summary_ID)
SELECT Tenant_Info_ID, Billing_Summary_ID FROM #Tenant_MaxBillSummary
UNION ALL
SELECT Tenant_Info_ID, Billing_Summary_ID FROM #Tenant_2ndToMaxBillSummary_SameDate
UNION ALL
SELECT Tenant_Info_ID, Billing_Summary_ID FROM #Tenant_2ndToMaxBillSummary_2ndDate
CREATE NONCLUSTERED INDEX idx_#Tenant_Top2BillSummaryRecords ON #Tenant_Top2BillSummaryRecords (Tenant_Info_ID, Billing_Summary_ID);
CREATE NONCLUSTERED INDEX idx_#Tenant_Top2BillSummaryRecords2 ON #Tenant_Top2BillSummaryRecords (Billing_Summary_ID, Tenant_Info_ID);
SELECT COUNT(*) -- On my system this runs in about ~14 seconds for a 524,288 row result
FROM (
SELECT TI.TenantId, TI.AccountNo
FROM #Tenant_Top2BillSummaryRecords A
JOIN Tenant_Info TI
ON A.Tenant_Info_ID = TI.TenantId
JOIN Billing_Summary BS
ON A.Billing_Summary_ID = BS.Id
JOIN Billing_Detail BD
ON BS.Id = BD.Billing_Summary_ID
GROUP BY TI.TenantId, TI.AccountNo
HAVING SUM(BD.Bill_Amount) = 0
) A