Syntax error Does using SERIAL as column name already includes 'NOT NULL' in MySQL?

Does using SERIAL as column name already includes 'NOT NULL' in MySQL?

In MySQL, SERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE. So, do not use NOT NULL after SERIAL, since it already includes NOT NULL as part of its definition.

Let us see an example and create a table. Here, we have a column with the name “serial” −

mysql> create table DemoTable
(
   Id serial
);
Query OK, 0 rows affected (0.42 sec)

Insert some records in the table using insert command. We aren’t including any value while inserting −

mysql> insert into DemoTable values();
Query OK, 1 row affected (0.24 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.06 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.09 sec)
mysql> insert into DemoTable values();
Query OK, 1 row affected (0.07 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+----+
| Id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
|  5 |
|  6 |
+----+
6 rows in set (0.00 sec)
Updated on: 2019-10-04T06:54:35+05:30

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