There Can Be Only One Auto Column and It Must Be Defined as a Key

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Fix MySQL Mistake 1075 (42000): Incorrect table definition; there tin be only one automobile column and information technology must be divers equally a central

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To ready this fault, you demand to add PRIMARY Cardinal to auto_increment field. Permit us now see how this error occurs −

Here, nosotros are creating a table and information technology gives the same error −

mysql> create table DemoTable (    StudentId int NOT Cipher AUTO_INCREMENT,    StudentName varchar(40),    StudentAge int ); Mistake 1075 (42000) : Incorrect table definition; there tin can be simply 1 motorcar column and it must be divers equally a cardinal

To solve the above error, you need to add PRIMARY KEY with AUTO_INCREMENT. Allow u.s.a. first create a table −

mysql> create table DemoTable (    StudentId int Non NULL AUTO_INCREMENT PRIMARY KEY,    StudentName varchar(40),    StudentAge int ); Query OK, 0 rows afflicted (1.01 sec)

Insert some records in the tabular array using insert command −

mysql> insert into DemoTable(StudentName,StudentAge) values('Chris Brown',nineteen); Query OK, 1 row afflicted (0.thirty sec) mysql> insert into DemoTable(StudentName,StudentAge) values('David Miller',18); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(StudentName,StudentAge) values('John Doe',20); Query OK, 1 row affected (0.11 sec)

Display all records from the table using select statement :

mysql> select *from DemoTable;

This will produce the following output −

+-----------+--------------+------------+ | StudentId | StudentName  | StudentAge | +-----------+--------------+------------+ |         i | Chris Brown  |         19 | |         two | David Miller |         18 | |         three | John Doe     |         20 | +-----------+--------------+------------+ 3 rows in set (0.00 sec)

Published on 07-Oct-2019 12:55:xix

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Source: https://www.tutorialspoint.com/fix-mysql-error-1075-42000-incorrect-table-definition-there-can-be-only-one-auto-column-and-it-must-be-defined-as-a-key

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