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Pseudo Columns

MariaDB has pseudo columns that can be used for different purposes

_rowid

Syntax

_rowid

Description

The _rowid pseudo column is mapped to the primary key in the related table. This can be used as a replacement of the rowid pseudo column in other databases. Another usage is to simplify sql queries as one doesn't have to know the name of the primary key.

Examples

CREATE TABLE t1 (a INT PRIMARY KEY, b VARCHAR(80));
INSERT INTO t1 VALUES (1,"one"),(2,"two");
SELECT * FROM t1 WHERE _rowid=1;

+---+------+
| a | b    |
+---+------+
| 1 | one  |
+---+------+

UPDATE t1 SET b="three" WHERE _rowid=2;
SELECT * FROM t1 WHERE _rowid>=1 and _rowid<=10;

+---+-------+
| a | b     |
+---+-------+
| 1 | one   |
| 2 | three |
+---+-------+

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