April 2006
Intermediate to advanced
640 pages
16h 46m
English
Content preview from Inside Microsoft® SQL Server™ 2005: T-SQL QueryingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Logical Query Processing Phase Details
This section describes the logical query processing phases in detail by applying them to the given sample query.
Step 1: Performing a Cartesian Product (Cross Join)
A Cartesian product (a cross join, or an unrestricted join) is performed between the first two tables that appear in the FROM clause, and as a result, virtual table VT1 is generated. VT1 contains one row for every possible combination of a row from the left table and a row from the right table. If the left table contains n rows and the right table contains m rows, VT1 will contain n × m rows. The columns in VT1 are qualified (prefixed) with their source table names (or table aliases, if you specified ones in the query). In the subsequent steps (step ...
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