Index VS JOIN - SQL Server Forums

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Index VS JOIN

Author

Topic

GenerationWithoutName
Starting Member

26 Posts

Posted - 2003-07-11 : 02:16:10

I'm confusing right now.i can't decide which one is faster.well, i have two tables like this:
CREATE TABLE tblTransA
( TransID int NOT NULL PRIMARY KEY,
TransDate smalldatetime,
AssetCost decimal(12,2),
Deposit decimal(12,2),
IsTransB varchar(1) DEFAULT('0') -->'0'=data TransA not in TransB,
-->'1'=data TransA in TransB
)
GO
CREATE INDEX IDX_IsTransB ON tblTransA(isTransB)
WITH PAD_INDEX, FILLFACTOR=90
GO
CREATE TABLE tblTransB
( TransID int NOT NULL PRIMARY KEY,
TransIDA int NOT NULL,
TransDate smalldatetime,
TransValue decimal(12,2)
)
GO
My Question is :
which faster with 100000 sample records
1. SELECT a.TransID, a.TransDate, a.AssetCost, a.Deposit
FROM tblTrans AS a
WHERE NOT EXISTS (SELECT TransIDA FROM tblTransB
WHERE TransIDA=a.TransID)
--or something like left outer join, or not in join statement
2. SELECT a.TransID, a.TransDate, a.AssetCost, a.Deposit
FROM tblTransA AS a
WHERE a.IsTransID='0'
-->if IsTransA='0' then data TransA not in TransB,
-->if IsTransA='1' then data TransA in TransB
it's use index instead of join statement
thank's all gurus

X002548
Not Just a Number

15586 Posts

Posted - 2003-07-11 : 09:28:37

We need to know the distribution of data between the 2 tables, but I believe NOT EXISTS (Or NOT anything) will Scan

How about:

SELECT * FROM Table1
LEFT JOIN Table 2
ON Table1.id = Table2.id
WHERE Table2.id IS NULL

Brett

8-)

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