What happens to the timestamp of a column in MariaDB?
If a DEFAULT clause is explicitly specified for a column that uses the TIMESTAMP data type, but an ON UPDATE clause is not specified for the column, then the timestamp value will not automatically change when an UPDATE statement is executed. MariaDB also has special behavior if NULL is assigned to column that uses the TIMESTAMP data type.
How to mark old temporal formats in MariaDB?
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. Note: Prior to MySQL 4.1 a different format for the TIMESTAMP datatype was used.
How is null value initialized in MariaDB?
If the column is assigned the NULL value in an INSERT or UPDATE query, then MariaDB will automatically initialize the column’s value with the current date and time. For details, see NULL values in MariaDB.
Is the time zone identifier stored in MariaDB?
If a column uses the TIMESTAMP data type, then any inserted values are converted from the session’s time zone to Coordinated Universal Time (UTC) when stored, and converted back to the session’s time zone when retrieved. MariaDB does not currently store any time zone identifier with the value of the TIMESTAMP data type.
What is the syntax for range partitioning in MariaDB?
A variant of this partitioning method, RANGE COLUMNS, allows us to use multiple columns and more datatypes. The last part of a CREATE TABLE statement can be definition of the new table’s partitions. In the case of RANGE partitioning, the syntax is the following:
When does MariaDB switch to history partition P1?
MariaDB will start writing history rows into partition p0, and when it reaches a size of 100000 rows, MariaDB will switch to partition p1. There are only two historical partitions, so when p1 overflows, MariaDB will issue a warning, but will continue writing into it.