相关疑难解决方法(0)

今天,在客户端的生产系统中,我发现了一个包含不熟悉语法的SQL Server查询.在下面的例子中,*=运营商做了什么？我在MSDN上找不到它.查询执行并返回数据.据我所知,自从他们使用SQL Server 2000以来,它一直存在于系统中,但它们现在正在运行2005.

declare @nProduct int
declare @iPricingType int
declare @nMCC int

set @nProduct = 4
set @iPricingType = 2
set @nMCC = 230

--Build SQL for factor matrix

Select distinct
base.uiBase_Price_ID,
base.nNoteRate, 
base.sDeliveryOpt, 
IsNull(base.nPrice,0) as nPrice, 
IsNull(base.nPrice,0) + Isnull(fact.nFactor,0) as nAdjPrice, 
base.iProduct_ID,
fact.iPosition as fiPosition, 
base.iPosition, 
CONVERT(varchar(20), base.dtDate_Updated, 101) + ' ' + CONVERT(varchar(20), base.dtDate_Updated, 108) as 'dtDate_Updated', 
fact.nFactor, 
fact.nTreasFactor, 
product.sProduct_txt ,  
pfi.sPFI_Name,  
mccprod.nServicing_Fee,  
fact.nNoteRate as fNoteRate,  
mcc.nLRA_Charge as nLRA  
From 
tbl_Base_Prices base, tbl_Factors …

我有一些旧的(破碎的)代码,使用*=连接

table1.ID *= table2.ID

这是左外连接还是右外连接？(我的错误消息表明它是其中之一)