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https://dev.mysql.com/doc/refman/8.0/en/constraint-foreign-key.html
MATCH options do not have any other effect in MySQL, which in effect enforces MATCH SIMPLE semantics full-time. Foreign keys let you cross-reference related data across tables, and foreign key constraints help keep this spread-out data consistent.
https://dev.mysql.com/doc/refman/8.0/en/constraints.html
We must handle the case when you have inserted or updated a lot of rows in a nontransactional table for which changes cannot be rolled back when an error occurs. MySQL enables you to work both with transactional tables that permit rollback and with ...
https://dev.mysql.com/doc/refman/8.0/en/corrupted-myisam-tables.html
Even though the MyISAM table format is very reliable (all changes to a table made by an SQL statement are written before the statement returns), you can still get corrupted tables if any of the following events occur: The mysqld process is killed ...
https://dev.mysql.com/doc/refman/8.0/en/cost-model.html
If the value is default, it applies to all storage engines that have no named entry of their own. To generate execution plans, the optimizer uses a cost model that is based on estimates of the cost of various operations that occur during query ...
https://dev.mysql.com/doc/refman/8.0/en/create-database.html
The underlying file system may have a limit on the number of directories. CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name [create_option] ... create_option: [DEFAULT] { CHARACTER SET [=] charset_name | COLLATE [=] collation_name | ENCRYPTION [=] ...
https://dev.mysql.com/doc/refman/8.0/en/create-function-loadable.html
CREATE [AGGREGATE] FUNCTION [IF NOT EXISTS] function_name RETURNS {STRING|INTEGER|REAL|DECIMAL} SONAME shared_library_name This statement loads the loadable function named function_name. (CREATE FUNCTION is also used to created stored functions; ...
https://dev.mysql.com/doc/refman/8.0/en/creating-database.html
If the administrator creates your database for you when setting up your permissions, you can begin using it. Otherwise, you need to create it yourself: mysql> CREATE DATABASE menagerie; Under Unix, database names are case-sensitive (unlike SQL ...
https://dev.mysql.com/doc/refman/8.0/en/creating-many-tables.html
If you have many MyISAM tables in the same database directory, open, close, and create operations are slow. If you execute SELECT statements on many different tables, there is a little overhead when the table cache is full, because for every table ...
https://dev.mysql.com/doc/refman/8.0/en/creating-spatial-columns.html
Columns with a spatial data type can have an SRID attribute, to explicitly indicate the spatial reference system (SRS) for values stored in the column. MySQL provides a standard way of creating spatial columns for geometry types, for example, with ...
https://dev.mysql.com/doc/refman/8.0/en/creating-ssl-files-using-openssl.html
This section describes how to use the openssl command to set up SSL certificate and key files for use by MySQL servers and clients. The first example shows a simplified procedure such as you might use from the command line. The first two examples ...