如何在sql中创建索引 [英] how to create index in sql

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本文介绍了如何在sql中创建索引的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

  ALTER  功能 dbo.getThisPVFooterAmount( @ PVoucherHeaderId   int  @ FooterAccountId   int 
RETURNS money AS
BEGIN

return trans_PurchaseVoucherDetails (< span class =code-keyword> nolock )
其中 PurchaseVoucherHeader_Id = @ PVoucherHeaderId Record_Type = ' F' 帐户_Id = @ FooterAccountId)
END



我有这个功能。如何在PurchaseVoucherHeader_Id上创建索引,Record_Type,Account_Id ????

解决方案





仅限对于相同的参数 - 确定性的函数 - 总是返回相同结果的函数可以被索引。


hi

  CREATE   INDEX  index_name  ON  table_name(column_name)


ALTER  FUNCTION dbo.getThisPVFooterAmount   ( @PVoucherHeaderId int ,@FooterAccountId int)
RETURNS money  AS
BEGIN

return (select Amount  from trans_PurchaseVoucherDetails with (nolock)
 where  PurchaseVoucherHeader_Id=@PVoucherHeaderId and  Record_Type ='F' And  Account_Id =@FooterAccountId  )
END


I have this function. how to create index on PurchaseVoucherHeader_Id,Record_Type,Account_Id ????

解决方案

Hi,

Only functions that always return the same result for the same parameters—functions that are deterministic—can be indexed.


hi

CREATE INDEX index_name ON table_name (column_name)


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