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Shifting values of rows in MySQL to change the existing id values for existing rows?
Let us first create a table −
mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) -> ); Query OK, 0 rows affected (1.07 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(StudentName) values('Chris');
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable(StudentName) values('Robert');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable(StudentName) values('David');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(StudentName) values('Mike');
Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1 | Chris | | 2 | Robert | | 3 | David | | 4 | Mike | +-----------+-------------+ 4 rows in set (0.00 sec)
Here is the query to shift id values of existing rows in MySQL −
mysql> update DemoTable set StudentId=StudentId+1000; Query OK, 4 rows affected (0.18 sec) Rows matched: 4 Changed: 4 Warnings: 0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+-------------+ | StudentId | StudentName | +-----------+-------------+ | 1001 | Chris | | 1002 | Robert | | 1003 | David | | 1004 | Mike | +-----------+-------------+ 4 rows in set (0.00 sec)
Updated on: 12-Dec-2019
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