MySQL Pocket Reference by George Reese
Author:George Reese [Reese, George]
Language: eng
Format: epub, pdf
Tags: Database Management, Web, JavaScript, Linux, Programming Languages, Electronic books, SQL (Computer program language), Computers, Programming, General, SQL, UNIX, Data Warehousing, Data Mining, Relational databases, MySQL (Electronic resource), Operating Systems
ISBN: 9780596004460
Publisher: O'Reilly Media, Inc.
Published: 2003-04-15T07:00:00+00:00
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EXPLAIN [table_name | sql_statement]
Used with a table name, this command is an alias for SHOW COLUMNS FROM table_name.
Used with an SQL statement, this command displays verbose information about the order and structure of a SELECT statement. This can be used to see where keys are not being used efficiently. This information is returned as a result set with the following columns:
table
The name of the table referenced by the result set row explaining the query.
type
The type of join that will be performed.
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