小编Nod*_*dja的帖子

我有以下select语句几乎立即完成.

declare @weekending varchar(6)  
set @weekending = 100103

select InvoicesCharges.orderaccnumber, Accountnumbersorders.accountnumber  
from Accountnumbersorders, storeinformation, routeselecttable,InvoicesCharges, invoice   
where InvoicesCharges.pubid = Accountnumbersorders.publication  
and Accountnumbersorders.actype = 0  
and Accountnumbersorders.valuezone = 'none'  
and storeinformation.storeroutename = routeselecttable.istoreroutenumber   
and storeinformation.storenumber = invoice.store_number  
and InvoicesCharges.invoice_number = invoice.invoice_number  
and convert(varchar(6),Invoice.bill_to,12) = @weekending  

但是,等效的更新语句需要1分40秒

declare @weekending varchar(6)
set @weekending = 100103
update InvoicesCharges  
set InvoicesCharges.orderaccnumber = Accountnumbersorders.accountnumber  
from Accountnumbersorders, storeinformation, routeselecttable,InvoicesCharges, invoice   
where InvoicesCharges.pubid = Accountnumbersorders.publication  
and Accountnumbersorders.actype = 0  
and dbo.Accountnumbersorders.valuezone = 'none'  
and storeinformation.storeroutename = routeselecttable.istoreroutenumber 
and …