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https://dev.mysql.com/doc/refman/8.0/en/date-and-time-types.html
The date and time data types for representing temporal values are DATE, TIME, DATETIME, TIMESTAMP, and YEAR. The TIMESTAMP and DATETIME types have special automatic updating behavior, described in Section 13.2.5, “Automatic Initialization and ...
https://dev.mysql.com/doc/refman/8.0/en/server-system-variables.html
avoid_temporal_upgrade Command-Line Format --avoid-temporal-upgrade[={OFF|ON}] Deprecated Yes System Variable avoid_temporal_upgrade Scope Global Dynamic Yes SET_VAR Hint Applies No Type Boolean Default Value OFF This variable controls whether ALTER ... The MySQL server maintains many system variables that affect its ...
https://dev.mysql.com/doc/refman/8.0/en/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 14.2, “Loadable Function Reference”. ->> Return value ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-events-table.html
EXECUTE_AT For a one-time event, this is the DATETIME value specified in the AT clause of the CREATE EVENT statement used to create the event, or of the last ALTER EVENT statement that modified the event. This is displayed as a DATETIME value, and ... The EVENTS table provides information about Event Manager events, which are discussed in Section 27.4, “Using the Event ...
https://dev.mysql.com/doc/refman/8.0/en/create-index.html
CREATE [UNIQUE | FULLTEXT | SPATIAL] INDEX index_name [index_type] ON tbl_name (key_part,...) [index_option] [algorithm_option | lock_option] ... This guideline is especially important for InnoDB tables, where the primary key determines the ...
https://dev.mysql.com/doc/refman/8.0/en/time-zone-support.html
Beginning with MySQL 8.0.19, time zone offsets are also supported for inserted datetime values; see Section 13.2.2, “The DATE, DATETIME, and TIMESTAMP Types”, for more information. The session time zone setting does not affect values displayed ... This section describes the time zone settings maintained by MySQL, how to load the system tables required for named time support, how to stay current with time zone changes, and how to enable leap-second ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
If one of the arguments is a TIMESTAMP or DATETIME column and the other argument is a constant, the constant is converted to a timestamp before the comparison is performed. To be safe, always use complete datetime, date, or time strings when doing ... When an operator is used with operands of different types, type conversion occurs to make the operands ...
https://dev.mysql.com/doc/refman/8.0/en/data-type-defaults.html
See Section 13.2.5, “Automatic Initialization and Updating for TIMESTAMP and DATETIME”. The exception is that, for TIMESTAMP and DATETIME columns, you can specify CURRENT_TIMESTAMP as the default. See Section 13.2.5, “Automatic Initialization ... Data type specifications can have explicit or implicit default ...
https://dev.mysql.com/doc/refman/8.0/en/show-events.html
Execute At For a one-time event, this is the DATETIME value specified in the AT clause of the CREATE EVENT statement used to create the event, or of the last ALTER EVENT statement that modified the event. This is displayed as a DATETIME value, and ... SHOW EVENTS [{FROM | IN} schema_name] [LIKE 'pattern' | WHERE expr] This statement displays information about Event Manager events, which are discussed in Section 27.4, “Using the Event ...
https://dev.mysql.com/doc/refman/8.0/en/storage-requirements.html
Leftover Digits Number of Bytes 0 0 1 1 2 1 3 2 4 2 5 3 6 3 7 4 8 4 Date and Time Type Storage Requirements For TIME, DATETIME, and TIMESTAMP columns, the storage required for tables created before MySQL 5.6.4 differs from tables created from 5.6.4 ... InnoDB Table Storage Requirements NDB Table Storage Requirements Numeric Type Storage Requirements Date and Time Type Storage Requirements String Type Storage Requirements Spatial Type Storage Requirements JSON Storage Requirements The storage requirements for table data on disk depend on several ...