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https://dev.mysql.com/doc/refman/5.7/en/declare-local-variable.html
type [DEFAULT value] This statement declares local variables within stored programs. To provide a default value for a variable, include a DEFAULT clause. The value can be specified as an expression; it need not be a constant. If the DEFAULT clause ...
https://dev.mysql.com/doc/refman/5.7/en/derived-table-optimization.html
The optimizer handles derived tables and view references the same way: It avoids unnecessary materialization whenever possible, which enables pushing down conditions from the outer query to derived tables and produces more efficient execution plans.
https://dev.mysql.com/doc/refman/5.7/en/drop-database.html
If the default database is dropped, the default database is unset (the DATABASE() function returns NULL). DROP {DATABASE | SCHEMA} [IF EXISTS] db_name DROP DATABASE drops all tables in the database and deletes the database. Be very careful with ...
https://dev.mysql.com/doc/refman/5.7/en/engine-condition-pushdown-optimization.html
This optimization improves the efficiency of direct comparisons between a nonindexed column and a constant. In such cases, the condition is “pushed down” to the storage engine for evaluation. This optimization can be used only by the NDB ...
https://dev.mysql.com/doc/refman/5.7/en/events-overview.html
For example, you could use the GET_LOCK() function, or row or table locking. MySQL Events are tasks that run according to a schedule. When you create an event, you are creating a named database object containing one or more SQL statements to be ...
https://dev.mysql.com/doc/refman/5.7/en/expired-password-handling.html
MySQL provides password-expiration capability, which enables database administrators to require that users reset their password. Passwords can be expired manually, and on the basis of a policy for automatic expiration (see Section 6.2.11, ...
https://dev.mysql.com/doc/refman/5.7/en/explain.html
You should be aware that while this makes the output easier to read, it also renders the JSON invalid, causing JSON functions to raise an error. In practice, the DESCRIBE keyword is more often used to obtain information about table structure, ...
https://dev.mysql.com/doc/refman/5.7/en/extended-show.html
Some extensions to SHOW statements accompany the implementation of INFORMATION_SCHEMA: SHOW can be used to get information about the structure of INFORMATION_SCHEMA itself. Several SHOW statements accept a WHERE clause that provides more ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-replication.html
In the following section, we provide answers to questions that are most frequently asked about MySQL Replication. Must the replica be connected to the source all the time? A.14.2. Must I enable networking on my source and replica to enable ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-security.html
Where can I find documentation that addresses security issues for MySQL? A.9.2. Is SSL support built into MySQL binaries, or must I recompile the binary myself to enable it? A.9.5. Does MySQL include support for Roles Based Access Control (RBAC)? ...