April 2006
Intermediate to advanced
640 pages
16h 46m
English
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Logical Query Processing Phases
This section introduces the phases involved in the logical processing of a query. I will first briefly describe each step. Then, in the following sections, I’ll describe the steps in much more detail and apply them to a sample query. You can use this section as a quick reference whenever you need to recall the order and general meaning of the different phases.
Example 1-1 contains a general form of a query, along with step numbers assigned according to the order in which the different clauses are logically processed.
Example 1-1. Logical query processing step numbers
(8) SELECT (9) DISTINCT (11) <TOP_specification> <select_list> (1) FROM <left_table> (3) <join_type> JOIN <right_table> (2) ON <join_condition> (4) WHERE ...
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