Error 1075: Incorrect table definition; there can be only one auto column and it must be defined as a key - Source

You are viewing an old version of this article. View the current version here

Revision: 143114
User: Ian Gilfillan
Date: 2024-09-09 13:40

== Possible Causes and Solutions

There can only be one [[auto_increment|AUTO_INCREMENT]] column per table, and the column must be defined as a [[getting-started-with-indexes|key]]. Not adhering to either of these restrictions will result in this error. For example:

<<sql>>
CREATE OR REPLACE TABLE animals (
    id1 MEDIUMINT NOT NULL AUTO_INCREMENT,
    id2 TINYINT NOT NULL AUTO_INCREMENT,
    name CHAR(30) NOT NULL,
    PRIMARY KEY (id1),
    KEY (id2)
);
ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key

CREATE OR REPLACE TABLE animals (
    id1 MEDIUMINT NOT NULL AUTO_INCREMENT,
    name CHAR(30) NOT NULL
);
ERROR 1075 (42000): Incorrect table definition; there can be only one auto column and it must be defined as a key

CREATE OR REPLACE TABLE animals (
    id MEDIUMINT NOT NULL AUTO_INCREMENT,
    name CHAR(30) NOT NULL,
    PRIMARY KEY (id)
);
Query OK, 0 rows affected (0.017 sec)
<</sql>>

Content reproduced on this site is the property of its respective owners, and this content is not reviewed in advance by MariaDB. The views, information and opinions expressed by this content do not necessarily represent those of MariaDB or any other party.

Error 1075: Incorrect table definition; there can be only one auto column and it must be defined as a key - Source

Products

Services

Pricing

Resources

About Us

Download MariaDB