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1.9 MySQL Standards Compliance
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Menu
* standards What Standards MySQL Follows
* sql-mode Selecting SQL Modes
* ansi-mode Running MySQL in ANSI Mode
* extensions-to-ansi MySQL Extensions to Standard SQL
* differences-from-ansi MySQL Differences from Standard SQL
* constraints How MySQL Deals with Constraints
This section describes how MySQL relates to the ANSI/ISO SQL standards.
MySQL Server has many extensions to the SQL standard, and here you can
find out what they are and how to use them. You can also find
information about functionality missing from MySQL Server, and how to
work around some of the differences.
The SQL standard has been evolving since 1986 and several versions
exist. In this manual, `SQL-92' refers to the standard released in
1992, `SQL:1999' refers to the standard released in 1999, and
`SQL:2003' refers to the current version of the standard. We use the
phrase `the SQL standard' or `standard SQL' to mean the current version
of the SQL Standard at any time.
One of our main goals with the product is to continue to work toward
compliance with the SQL standard, but without sacrificing speed or
reliability. We are not afraid to add extensions to SQL or support for
non-SQL features if this greatly increases the usability of MySQL
Server for a large segment of our user base. The `HANDLER' interface
is an example of this strategy. See handler.
We continue to support transactional and non-transactional databases to
satisfy both mission-critical 24/7 usage and heavy Web or logging usage.
MySQL Server was originally designed to work with medium-sized
databases (10-100 million rows, or about 100MB per table) on small
computer systems. Today MySQL Server handles terabyte-sized databases,
but the code can also be compiled in a reduced version suitable for
hand-held and embedded devices. The compact design of the MySQL server
makes development in both directions possible without any conflicts in
the source tree.
Currently, we are not targeting real-time support, although MySQL
replication capabilities offer significant functionality.
MySQL supports high-availability database clustering using the
`NDBCluster' storage engine. See ndbcluster.
XML support is to be implemented in a future version of the database
server.
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