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Inserting data into a new column of an already existing table in MySQL?
Let us first create a table −
mysql> create table DemoTable( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(100) ); Query OK, 0 rows affected (0.47 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Name) values('John');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(Name) values('Bob');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable(Name) values('Adam');
Query OK, 1 row affected (0.28 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+------+ | Id | Name | +----+------+ | 1 | John | | 2 | Bob | | 3 | Adam | +----+------+ 3 rows in set (0.00 sec)
Here is the query to add column −
mysql> alter table DemoTable add column Gender ENUM('MALE','FEMALE');
Query OK, 0 rows affected (0.55 sec)
Records :0 Duplicates : 0 Warnings : 0Following is the query to insert data into a new column of an already existing table −
mysql> update DemoTable set Gender='FEMALE' where Id=2; Query OK, 1 row affected (0.13 sec) Rows matched − 1 Changed − 1 Warnings − 0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+----+------+--------+ | Id | Name | Gender | +----+------+--------+ | 1 | John | NULL | | 2 | Bob | FEMALE | | 3 | Adam | NULL | +----+------+--------+ 3 rows in set (0.00 sec)
Updated on: 03-Sep-2019
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