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

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>>

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

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