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Posted by Plamen Ratchev on 03/23/07 19:20
What you are using here is the old join syntax, which lists that tables to
join in the FROM clause separated by a comma and then the filters are
applied in the WHERE clause. To use this syntax with multiple columns you
just keep adding the pairs of columns to match, like this:
SELECT <column list>
FROM tableA, tableB
WHERE tableA.col1 = tableB.col1
AND tableA.col2 = tableB.col2
... <and so on keep adding more filters if needed>
The newer syntax uses the JOIN keyword, like this:
SELECT <column list>
FROM tableA
INNER JOIN tableB
ON tableA.col1 = tableB.col1
AND tableA.col2 = tableB.col2
... <and so on keep adding more filters if needed>
There are different types of joins: CROSS, INNER, and OUTER (LEFT, RIGHT, or
FULL). Also, there are a couple ANSI joins currently not supported by SQL
Server (natural and union joins).
Here is more information on using joins:
http://msdn2.microsoft.com/en-us/library/ms191472.aspx
HTH,
Plamen Ratchev
http://www.SQLStudio.com
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