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How to make MySQL table primary key auto increment?
To make MySQL table primary key auto increment, use the below syntax
CREATE TABLE yourTableName ( yourColumnName INT(6) ZEROFILL NOT NULL AUTO_INCREMENT, PRIMARY KEY(yourColumnName) );
Let us first create a table and set primary key auto increment −
mysql> CREATE TABLE DemoTable ( UserId INT(6) ZEROFILL NOT NULL AUTO_INCREMENT, PRIMARY KEY(UserId) ); Query OK, 0 rows affected (0.81 sec)
Insert some records in the table using insert command −
mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.12 sec) mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.13 sec) mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.10 sec) mysql> INSERT INTO DemoTable values(); Query OK, 1 row affected (0.44 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+--------+ | UserId | +--------+ | 000001 | | 000002 | | 000003 | | 000004 | +--------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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