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https://dev.mysql.com/doc/refman/8.0/en/date-and-time-types.html
Unpredictable results may occur if you use values in other formats. The following table shows the format of the “zero” value for each type. The “zero” values are special, but you can store or refer to them explicitly using the values shown ... The date and time data types for representing temporal values are DATE, TIME, DATETIME, TIMESTAMP, and ...
https://dev.mysql.com/doc/refman/8.0/en/declare-condition.html
DECLARE condition_name CONDITION FOR condition_value condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value } The DECLARE ... CONDITION statement declares a named error condition, associating a name with a condition that needs ...
https://dev.mysql.com/doc/refman/8.0/en/disk-issues.html
If your computer is reasonably stable, this should give you better performance without sacrificing too much reliability. This section describes ways to configure storage devices when you can devote more and faster storage hardware to the database ...
https://dev.mysql.com/doc/refman/8.0/en/example-maximum-column-group-row.html
Other possibilities for solving the problem are to use an uncorrelated subquery in the FROM clause, a LEFT JOIN, or a common table expression with a window function. Common table expression with window function: WITH s1 AS ( SELECT article, dealer, ... Task: For each article, find the dealer or dealers with the most expensive ...
https://dev.mysql.com/doc/refman/8.0/en/exists-and-not-exists-subqueries.html
If a subquery returns any rows at all, EXISTS subquery is TRUE, and NOT EXISTS subquery is FALSE. For example: SELECT column1 FROM t1 WHERE EXISTS (SELECT * FROM t2); Traditionally, an EXISTS subquery starts with SELECT *, but it could begin with ...
https://dev.mysql.com/doc/refman/8.0/en/firewall-elements.html
The MYSQL_FIREWALL plugin, along with server-side plugins named MYSQL_FIREWALL_USERS and MYSQL_FIREWALL_WHITELIST implement Performance Schema and INFORMATION_SCHEMA tables that provide views into the registered profiles. Tables in the mysql system ... MySQL Enterprise Firewall is based on a plugin library that includes these elements: A server-side plugin named MYSQL_FIREWALL examines SQL statements before they execute and, based on the registered firewall profiles, renders a decision whether to execute or reject each ...
https://dev.mysql.com/doc/refman/8.0/en/gis-data-formats.html
For example, a WKB value that corresponds to POINT(1 -1) consists of this sequence of 21 bytes, each represented by two hexadecimal digits: 0101000000000000000000F03F000000000000F0BF The sequence consists of the components shown in the following ...
https://dev.mysql.com/doc/refman/8.0/en/gis-linestring-property-functions.html
A unit is supported if it is found in the INFORMATION_SCHEMA ST_UNITS_OF_MEASURE table. You can extract particular points of a LineString, count the number of points that it contains, or obtain its length. Unless otherwise specified, functions in ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-observability.html
The entire state of the system (including the view, conflict statistics and service states) can be queried through Performance Schema tables. For example, you can connect to a single server in the group and obtain both local and global information ... There is a lot of automation built into the Group Replication ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-responses-failure-exit.html
The group_replication_exit_state_action system variable, which is available from MySQL 8.0.12 and MySQL 5.7.24, specifies what Group Replication does when the member leaves the group unintentionally due to an error or problem, and either fails to ...