SQL查詢優化

Question

我必須執行此查詢這需要大約52秒我已經意味着使用遊標或者無論如何，可以幫助我優化執行時間

select * from (
select distinct 'Net Sales' Class, SUM (CAST(ROUND(ABS(dbo.Trial_Balance_Variances.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112))) 
- (select distinct sum(CAST(ROUND(ABS(v.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), v.PERIOD_DATE, 112))) from Trial_Balance_Variances v 
inner join 
dbo.[P&L] p ON v.GL_ACCOUNT_NUMBER = p.Code where p.Category in('Sales Rebates') 
and v.PERIOD_NAME = Trial_Balance_Variances.PERIOD_NAME 
    ) Total,CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112)) AS DateKey 
from Trial_Balance_Variances 
inner join 
dbo.[P&L] ON dbo.Trial_Balance_Variances.GL_ACCOUNT_NUMBER = dbo.[P&L].Code LEFT OUTER JOIN 
dbo.Location AS l ON l.Code = SUBSTRING(CONVERT(varchar(50), dbo.Trial_Balance_Variances.ACCOUNT_COMBINATION), 4, 2) where Category = 'Potash Sales (Gross)' 

union 

SELECT distinct l.Class, SUM (CAST(ROUND(ABS(dbo.Trial_Balance_Variances.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112))) 
+ (select distinct sum(CAST(ROUND(ABS(v.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), v.PERIOD_DATE, 112))) from Trial_Balance_Variances v 
inner join 
dbo.[P&L] p ON v.GL_ACCOUNT_NUMBER = p.Code where p.Category in('Change In Inventory','Freight','Dispatch') 
and v.PERIOD_NAME = Trial_Balance_Variances.PERIOD_NAME 
    ) Total 
, CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112)) AS DateKey from Trial_Balance_Variances 
inner join 
dbo.[P&L] ON dbo.Trial_Balance_Variances.GL_ACCOUNT_NUMBER = dbo.[P&L].Code LEFT OUTER JOIN 
dbo.Location AS l ON l.Code = SUBSTRING(CONVERT(varchar(50), dbo.Trial_Balance_Variances.ACCOUNT_COMBINATION), 4, 2) 
where Class='Cost of goods sold' and Category not in ('Sales Rebates','Royalties','Potash Sales (Gross)','Interest Expense LTL','Interest Expense LTMed','Interest Expense Others' 
,'Interest Income','(Gain)/Loss from Investment Jor','(Gain)/Loss from Investment N+B','Gain from Investment', 'EXC Gain from Investment' ,'D Gain from Investment ', 'Loss from Investment Jormag','Bank Charges','Other Revenues','Change In Inventory','Freight','Dispatch') 

union 

SELECT distinct l.Class, SUM (CAST(ROUND(ABS(dbo.Trial_Balance_Variances.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112))) Total 
, CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112)) AS DateKey from Trial_Balance_Variances 
inner join 
dbo.[P&L] ON dbo.Trial_Balance_Variances.GL_ACCOUNT_NUMBER = dbo.[P&L].Code LEFT OUTER JOIN 
dbo.Location AS l ON l.Code = SUBSTRING(CONVERT(varchar(50), dbo.Trial_Balance_Variances.ACCOUNT_COMBINATION), 4, 2) 
where Class='Administration' and Category not in ('Sales Rebates','Royalties','Potash Sales (Gross)','Interest Expense LTL','Interest Expense LTMed','Interest Expense Others' 
,'Interest Income','(Gain)/Loss from Investment Jor','(Gain)/Loss from Investment N+B','Gain from Investment', 'EXC Gain from Investment' ,'D Gain from Investment ', 'Loss from Investment Jormag','Bank Charges','Change In Inventory','Freight','Dispatch','Other Revenues') 
union 

SELECT distinct l.Class, SUM (CAST(ROUND(ABS(dbo.Trial_Balance_Variances.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112))) Total 
, CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112)) AS DateKey from Trial_Balance_Variances 
inner join 
dbo.[P&L] ON dbo.Trial_Balance_Variances.GL_ACCOUNT_NUMBER = dbo.[P&L].Code LEFT OUTER JOIN 
dbo.Location AS l ON l.Code = SUBSTRING(CONVERT(varchar(50), dbo.Trial_Balance_Variances.ACCOUNT_COMBINATION), 4, 2) 
where Class='Selling And Distribution Expenses' and Category not in ('Sales Rebates','Royalties','Potash Sales (Gross)','Interest Expense LTL','Interest Expense LTMed','Interest Expense Others' 
,'Interest Income','(Gain)/Loss from Investment Jor','(Gain)/Loss from Investment N+B','Gain from Investment', 'EXC Gain from Investment' ,'D Gain from Investment ', 'Loss from Investment Jormag','Bank Charges','Change In Inventory','Freight','Dispatch','Other Revenues') 

union 


SELECT distinct l.Class, SUM (CAST(ROUND(ABS(dbo.Trial_Balance_Variances.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112))) 
+ (select distinct sum(CAST(ROUND(ABS(v.PTD_ACTUAL), 0) AS float)) over (partition by CONVERT(int,CONVERT(varchar(10), v.PERIOD_DATE, 112))) from Trial_Balance_Variances v 
inner join 
    dbo.[P&L] p ON v.GL_ACCOUNT_NUMBER = p.Code where p.Category in('Interest Expense LTL','Interest Expense LTMed','Interest Expense Others' 
,'Interest Income','(Gain)/Loss from Investment Jor','(Gain)/Loss from Investment N+B','Gain from Investment', 'EXC Gain from Investment' ,'D Gain from Investment ', 'Loss from Investment Jormag','Bank Charges','Other Revenues') 
    and v.PERIOD_NAME = Trial_Balance_Variances.PERIOD_NAME and SUBSTRING(CONVERT(varchar(50), v.ACCOUNT_COMBINATION), 4, 2) not in ('00','05') 
    ) 
, CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112)) AS DateKey from Trial_Balance_Variances 
inner join 
dbo.[P&L] ON dbo.Trial_Balance_Variances.GL_ACCOUNT_NUMBER = dbo.[P&L].Code LEFT OUTER JOIN 
dbo.Location AS l ON l.Code = SUBSTRING(CONVERT(varchar(50), dbo.Trial_Balance_Variances.ACCOUNT_COMBINATION), 4, 2) 
where Class='Others' and 
Category not in ('Sales Rebates','Royalties','Potash Sales (Gross)','Change In Inventory','Freight','Dispatch')) x order by x.DateKey 

誰能幫我解決這個問題請問？

Answer 1

SUBSTRING()是一個標量函數，這意味着他們需要在他們被調用的每一行上運行。如果可以的話，可以省略它們或在減少記錄集後運行它們。

我不相信你需要轉換爲int得到這個排序工作，你希望的方式在這個SQL：

CONVERT(int,CONVERT(varchar(10), dbo.Trial_Balance_Variances.PERIOD_DATE, 112)) 

刪除convert(int,....)部分，看看會發生什麼。

Distinct在效率上相當低效。我建議將它們全部更改爲分組。爲了解決這個問題，我建議把所有東西放到臨時表中，然後做最後的選擇，這樣你只需要做一次。

如果你想要任何特定的東西，給我們一些a Fiddle測試數據將有所幫助！