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https://dev.mysql.com/doc/refman/8.4/en/data-masking-component-usage.html
Thus, even though ssn is defined as VARCHAR(11), if the ssn column has a multibyte character set, it may appear to be longer than 11 bytes when passed to a loadable function, and returns NULL while logging the error. Before using MySQL Enterprise ...
https://dev.mysql.com/doc/refman/8.4/en/data-size.html
It makes SQL operations faster, by enabling better use of indexes and eliminating overhead for testing whether each value is NULL. If you really need NULL values in your tables, use them. Just avoid the default setting that allows NULL values in ...
https://dev.mysql.com/doc/refman/8.4/en/date-and-time-literals.html
Standard SQL and ODBC Date and Time Literals String and Numeric Literals in Date and Time Context Date and time values can be represented in several formats, such as quoted strings or as numbers, depending on the exact type of the value and other ...
https://dev.mysql.com/doc/refman/8.4/en/events-configuration.html
row *************************** Id: 1 User: root Host: localhost db: NULL Command: Query Time: 0 State: NULL Info: show processlist *************************** 2. row *************************** Id: 2 User: event_scheduler Host: localhost db: NULL ... Events are executed by a special event scheduler thread; when we refer to the Event Scheduler, we actually refer to this ...
https://dev.mysql.com/doc/refman/8.4/en/gis-wkb-functions.html
Unless otherwise specified, functions in this section handle their geometry arguments as follows: If the WKB or SRID argument is NULL, the return value is NULL. If the options argument is NULL, the return value is NULL. These functions take as ...
https://dev.mysql.com/doc/refman/8.4/en/group-by-handling.html
The query is invalid if name is not a primary key of t or a unique NOT NULL column. SQL-92 and earlier does not permit queries for which the select list, HAVING condition, or ORDER BY list refer to nonaggregated columns that are not named in the ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-information-schema-system-tables.html
row *************************** TABLE_ID: 71 NAME: col1 POS: 0 MTYPE: 6 PRTYPE: 1027 LEN: 4 HAS_DEFAULT: 0 DEFAULT_VALUE: NULL *************************** 2. row *************************** TABLE_ID: 71 NAME: col2 POS: 1 MTYPE: 2 PRTYPE: 524542 LEN: ... You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/8.4/en/innodb-troubleshooting-datadict.html
A warning is issued indicating that InnoDB is attempting to import the file without schema verification. Information about table definitions is stored in the InnoDB data dictionary. If you move data files around, dictionary data can become ...
https://dev.mysql.com/doc/refman/8.4/en/locking-functions.html
Returns 1 if the lock was obtained successfully, 0 if the attempt timed out (for example, because another client has previously locked the name), or NULL if an error occurred (such as running out of memory or the thread was killed with mysqladmin ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbinfo-operations-per-fragment.html
The operations_per_fragment table provides information about the operations performed on individual fragments and fragment replicas, as well as about some of the results from these operations. This currently has the following formats: Base table: ...