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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/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/spatial-relation-functions-mbr.html
MBRCoveredBy() handles its arguments as follows: If either argument is NULL or an empty geometry, the return value is NULL. MBRCovers() handles its arguments as follows: If either argument is NULL or an empty geometry, the return value is NULL.
https://dev.mysql.com/doc/refman/5.7/en/scalar-subqueries.html
A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those characteristics that all operands have: a data type, a length, an indication that it can be ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-processlist-table.html
row *************************** ID: 5 USER: event_scheduler HOST: localhost DB: NULL COMMAND: Daemon TIME: 137 STATE: Waiting on empty queue INFO: NULL *************************** 2. row *************************** ID: 9 USER: me HOST: ... Note The ...
https://dev.mysql.com/doc/refman/5.7/en/selecting-all.html
For example, you may happen to think that the birth date for Bowser does not seem quite right. Consulting your original pedigree papers, you find that the correct birth year should be 1989, not 1979. Fix only the erroneous record with an UPDATE ...
https://dev.mysql.com/doc/refman/5.7/en/select-into.html
If the FIELDS ESCAPED BY character is empty, no characters are escaped and NULL is output as NULL, not \N. INTO form of SELECT enables a query result to be stored in variables or written to a file: SELECT ... Column and line terminators can be ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-statements-current-table.html
END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the event ends. If an event is produced from an instrument that has TIMED = NO, timing information is not collected, and TIMER_START, ...The table stores one row per thread showing the current status of the thread's most recent monitored statement event, so there is no system variable for configuring the table ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning.html
See Section 24.3.16, “The INFORMATION_SCHEMA PARTITIONS Table”, for more information; for some examples of queries against this table, see Section 22.2.7, “How MySQL Partitioning Handles NULL”. Note As of MySQL 5.7.17, the generic ...
https://dev.mysql.com/doc/refman/5.7/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 13.1.20, “CREATE TRIGGER Statement”, and Section 13.1.31, “DROP TRIGGER Statement”. Here is a simple example that associates a ...