How to use the sequence object introduced in MariaDB 10.0.3

How to use the sequence object introduced in MariaDB 10.0.3

Version

Version
10.3.36-MariaDB

Sequence storage engine confirmation

Sequence storage engine has been added since MariaDB 10.0.3.

SHOW engines;
Engine Support Comment Transactions XA Savepoints
CSV YES Stores tables as CSV files NO NO NO
MRG_MyISAM YES Collection of identical MyISAM tables NO NO NO
MEMORY YES Hash based, stored in memory, useful for temporary tables NO NO NO
MyISAM YES Non-transactional engine with good performance and small data footprint NO NO NO
SEQUENCE YES Generated tables filled with sequential values YES NO YES
InnoDB DEFAULT Supports transactions, row-level locking, foreign keys and encryption for tables YES YES YES
Aria YES Crash-safe tables with MyISAM heritage NO NO NO
PERFORMANCE_SCHEMA YES Performance Schema NO NO NO

The SEQUENCE row has been added, since it is a plugin for MariaDB and MySQL does not have this functionality.

ha_sequence plugin usage in MySQL
Is there any possibility to use the ha_sequence plugin provided by MariaDB in MySQL ( Or does a similar plugin exist for...

How to use sequence objects

Dynamically change the table names and assign sequences as follows

seq_[FROM]_to_[TO]

Examples from 0 to 6.

>SELECT seq FROM seq_0_to_6
0
1
2
3
4
5
6

The default is to increment by 1, but can be specified as follows

seq_[FROM]to[TO]step[STEP]

Example of increasing by 3.

>SELECT seq FROM seq_0_to_9_step_3
0
3
6
9

It is also possible to JOIN these virtual tables together and do other complex things.

This feature may have been added because MySQL does not have a feature like rowid in Oracle.

コメント

タイトルとURLをコピーしました