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https://dev.mysql.com/doc/refman/5.7/en/creating-tables.html
You want a table that contains a record for each of your pets. This can be called the pet table, and it should contain, as a bare minimum, each animal's name. Because the name by itself is not very interesting, the table should contain other ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-columns-table.html
This is NULL if the column has an explicit default of NULL, or if the column definition includes no DEFAULT clause. The value is YES if NULL values can be stored in the column, NO if not. (A UNIQUE index permits multiple NULL values, but you can ...
https://dev.mysql.com/doc/refman/5.7/en/getting-information.html
To find out which database is currently selected, use the DATABASE() function: mysql> SELECT DATABASE(); +------------+ | DATABASE() | +------------+ | menagerie | +------------+ If you have not yet selected any database, the result is NULL. What ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-events-table.html
If the event's timing is determined by an EVERY clause instead of an AT clause (that is, if the event is recurring), the value of this column is NULL. This is displayed as a DATETIME value, and is NULL if no start date and time are defined for the ... The EVENTS table provides information about Event Manager events, which are discussed in Section 23.4, “Using the Event ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-disk-data-objects.html
An extra “NULL row” provides additional information about undo log files. NDB Cluster Disk Data storage is implemented using a number of Disk Data objects. These include the following: Tablespaces act as containers for other Disk Data objects.
https://dev.mysql.com/doc/refman/5.7/en/partitioning-info.html
row *************************** id: 1 select_type: SIMPLE table: trb1 partitions: p0,p1,p2,p3 type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 10 Extra: Using filesort In this case, all four partitions are searched. This ...
https://dev.mysql.com/doc/refman/5.7/en/encrypted-connection-protocols-ciphers.html
MySQL supports multiple TLS protocols and ciphers, and enables configuring which protocols and ciphers to permit for encrypted connections. It is also possible to determine which protocol and cipher the current session uses. Supported Connection ...
https://dev.mysql.com/doc/refman/5.7/en/ldap-pluggable-authentication.html
Note LDAP pluggable authentication is an extension included in MySQL Enterprise Edition, a commercial product. As of MySQL 5.7.19, MySQL Enterprise Edition supports an authentication method that enables MySQL Server to use LDAP (Lightweight ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-memory.html
To replicate this effect to replicas, the first time that the source uses a given MEMORY table after startup, it logs an event that notifies replicas that the table must be emptied by writing a DELETE or (from MySQL 5.7.32) TRUNCATE TABLE statement ... When a replication source server shuts down and restarts, its MEMORY tables become ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-gtids.html
The MySQL Server system variables described in this section are used to monitor and control Global Transaction Identifiers (GTIDs). For additional information, see Section 16.1.3, “Replication with Global Transaction Identifiers”.