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How to add a column using MySQL SELECT in an already created table?
Let us first create a table −
mysql> create table DemoTable -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100), -> Age int -> ); Query OK, 0 rows affected (0.49 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Name,Age) values('Robert',24);
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(Name,Age) values('Chris',22);
Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+----+--------+------+ | Id | Name | Age | +----+--------+------+ | 1 | Robert | 24 | | 2 | Chris | 22 | +----+--------+------+ 2 rows in set (0.00 sec)
Here is the query to add a new column while using SELECT −
mysql> select Id,Name,Age,'US' AS DefaultCountryName from DemoTable;
Output
+----+--------+------+--------------------+ | Id | Name | Age | DefaultCountryName | +----+--------+------+--------------------+ | 1 | Robert | 24 | US | | 2 | Chris | 22 | US | +----+--------+------+--------------------+ 2 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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