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Add an autoincrement column with a custom start value in MySQL
To add a new column to an already created table, use ALTER TABLE and ADD COLUMN. Use AUTO_INCREMENT to set auto increment custom value.
Let us first create a table −
mysql> create table DemoTable -> ( -> StudentName varchar(20) -> ); Query OK, 0 rows affected (0.63 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('Robert');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Adam');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('Mike');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-------------+ | StudentName | +-------------+ | Robert | | Adam | | Mike | +-------------+ 3 rows in set (0.00 sec)
Following is the query to add an autoincrement column with start value −
mysql> alter table DemoTable add column StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,AUTO_INCREMENT=1000; Query OK, 0 rows affected (1.83 sec) Records: 0 Duplicates: 0 Warnings: 0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+-------------+-----------+ | StudentName | StudentId | +-------------+-----------+ | Robert | 1000 | | Adam | 1001 | | Mike | 1002 | +-------------+-----------+ 3 rows in set (0.00 sec)
Updated on: 13-Dec-2019
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