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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-statements-history-table.html
When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is added. The events_statements_history table contains the N most recent statement events that have ended per ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-transactions-history-table.html
When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is added. The events_transactions_history table contains the N most recent transaction events that have ended ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-waits-history-table.html
When the table contains the maximum number of rows for a given thread, the oldest thread row is discarded when a new row for that thread is added. The events_waits_history table contains the N most recent wait events that have ended per thread.
https://dev.mysql.com/doc/refman/5.7/en/alter-function.html
ALTER FUNCTION func_name [characteristic ...] characteristic: { COMMENT 'string' | LANGUAGE SQL | { CONTAINS SQL | NO SQL | READS SQL DATA | MODIFIES SQL DATA } | SQL SECURITY { DEFINER | INVOKER } } This statement can be used to change the ...
https://dev.mysql.com/doc/refman/5.7/en/calculating-days.html
The following example shows how you can use the bit group functions to calculate the number of days per month a user has visited a Web page. CREATE TABLE t1 (year YEAR, month INT UNSIGNED, day INT UNSIGNED); INSERT INTO t1 ...
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/group-replication-examples-of-use-case-scenarios.html
The following examples are typical use cases for Group Replication. Elastic Replication - Environments that require a very fluid replication infrastructure, where the number of servers has to grow or shrink dynamically and with as few side-effects ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-mysql-firewall-users-table.html
The MYSQL_FIREWALL_USERS table provides a view into the in-memory data cache for MySQL Enterprise Firewall. It lists names and operational modes of registered firewall account profiles. It is used in conjunction with the mysql.firewall_users system ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-data-dictionary.html
The InnoDB data dictionary is comprised of internal system tables that contain metadata used to keep track of objects such as tables, indexes, and table columns. For historical reasons, data dictionary metadata overlaps to some degree with ...
https://dev.mysql.com/doc/refman/5.7/en/logical-operators.html
Table 12.5 Logical Operators Name Description AND, && Logical AND NOT, ! Negates value OR, || Logical OR XOR Logical XOR In SQL, all logical operators evaluate to TRUE, FALSE, or NULL (UNKNOWN). In MySQL, these are implemented as 1 (TRUE), 0 ...