Unknow Operator

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Unknow Operator

Charles Xavier-485643

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Points: 6
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July 23, 2008 at 5:29 am

#188478

Good Day People
I was working with some queries in MSSQL 2000 When a found this operator
' *= ' in a Where Clause.
Anyone can tell me what´s the meaning of this operator.
I search on some places but i didn´t find info about this.
Thx

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ChrisM@Work SSC Guru Points: 186127 More actions · Answer 1

It's a left join, Charles.

Return all rows from the table on the left side of the operator, and only matching rows from the table on the right.

SELECT a.*

FROM TableA a, TableB b

WHERE a.column *= b.column

Is the same as

SELECT a.*

FROM TableA a

LEFT JOIN TableB b on b.column = a.column

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

Charles Xavier-485643 Newbie Points: 6 More actions · Answer 2

Thanks for the reply it´s cleared the queries a little

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 3

You're welcome. Might be worth your while taking a look at the following thread:

http://www.sqlservercentral.com/Forums/Topic532242-338-1.aspx#bm532442

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden