`dt0` datetime /* mariadb-5.3 */ DEFAULT NULL, Starting from MariaDB 10.5.1 columns with old temporal formats are marked with a /* mariadb-5.3 */ comment in the output of SHOW CREATE TABLE, SHOW COLUMNS, DESCRIBE statements, as well as in the COLUMN_TYPE column of the INFORMATION_SCHEMA.COLUMNS Table. The columns using relevant temporal data types are restored using the new temporal format. In the event that you have several tables and columns using temporal data types that you want to switch over to the new format, make sure the system variable is enabled, then perform a dump and restore using mysqldump. When MariaDB executes the ALTER TABLE statement, it converts the data from the older temporal format to the newer one. This change may be needed if you want to export the table's tablespace and import it onto a server that has mysql56_temporal_format=ON set (see MDEV-15225).įor instance, if you have a DATETIME column in your table: SHOW VARIABLES LIKE 'mysql56_temporal_format' + -+-+ | Variable_name | Value | + -+-+ | mysql56_temporal_format | ON | + -+-+ ALTER TABLE example_table MODIFY ts_col DATETIME
MODIFY COLUMN statement that changes the column to the *same* data type.
#MYSQL INSERT DATETIME UPDATE#
In order to update table columns from the older format to the newer format, execute an ALTER TABLE. Tables that include TIMESTAMP values that were created on an older version of MariaDB or that were created while the mysql56_temporal_format system variable was disabled continue to store data using the older data type format. You can disable this feature using the mysql56_temporal_format system variable. These changes allow these temporal data types to have fractional parts and negative values. In MariaDB 10.1.2 a new temporal format was introduced from MySQL 5.6 that alters how the TIME, DATETIME and TIMESTAMP columns operate at lower levels. In Oracle mode from MariaDB 10.3, DATE with a time portion is a synonym for DATETIME.
If the ALLOW_INVALID_DATES SQL_MODE is enabled, if the day part is in the range between 1 and 31, the date does not produce any error, even for months that have less than 31 days. In many cases, the result of en expression involving a zero-date, or a date with zero-parts, is NULL.
Similarly, individual components of a date can be set to 0 (for example: ' '), unless NO_ZERO_IN_DATE is specified in the SQL_MODE. MariaDB also supports ' ' as a special zero-date value, unless NO_ZERO_DATE is specified in the SQL_MODE. If no microsecond precision is specified, then 0 is used by default. MariaDB can also store microseconds with a precision between 0 and 6. MariaDB stores values that use the DATETIME data type in a format that supports values between 00:00:00.
For more information, see Internal Format, below.įor storage requirements, see Data Type Storage Requirements. MariaDB 10.1.2 introduced the -mysql56-temporal-format option, on by default, which allows MariaDB to store DATETMEs using the same low-level format MySQL 5.6 uses. For details, see date and time literals.ĭATETIME columns also accept CURRENT_TIMESTAMP as the default value. MariaDB displays DATETIME values in ' YYYY-MM-DD HH:MM:SS.ffffff' format, butĪllows assignment of values to DATETIME columns using either strings or
0 kommentar(er)
