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Version 4.1 of the MySQL server includes many enhancements and new features. Binaries for this version are available for download at http://www.mysql.com/downloads/mysql-4.1.html.
INSERT ... ON DUPLICATE KEY UPDATE ...
syntax. This allows you to
UPDATE
an existing row if the insert would cause a duplicate value
in a PRIMARY
or UNIQUE
key. (REPLACE
allows you to
overwrite an existing row, which is something entirely different.)
See section 13.1.4 INSERT
Syntax.
GROUP_CONCAT()
aggregate function.
See section 12.7 Functions and Modifiers for Use with GROUP BY
Clauses.
MyISAM
tables with many tunable parameters. You can
have multiple key caches, preload index into caches for batches...
BTREE
index on HEAP
tables.
SHOW WARNINGS
shows warnings for the last command.
See section SHOW WARNINGS
.
CREATE [TEMPORARY] TABLE [IF NOT EXISTS] table2 LIKE
table1
.
HELP
command that can be used in the mysql
command line client (and other clients) to get help for SQL statements.
For a full list of changes, please refer to the changelog sections for each individual 4.1.x release.
C.2.1 Changes in release 4.1.2 (not released yet) | ||
C.2.2 Changes in release 4.1.1 (01 Dec 2003) | ||
C.2.3 Changes in release 4.1.0 (03 Apr 2003: Alpha) |
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