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How to generate field in MySQL SELECT?
Use keyword AS for this. Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) ); Query OK, 0 rows affected (3.16 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Name) values('John');
Query OK, 1 row affected (0.50 sec)
mysql> insert into DemoTable(Name) values('Robert');
Query OK, 1 row affected (0.29 sec)
mysql> insert into DemoTable(Name) values('David');
Query OK, 1 row affected (0.54 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+----+--------+ | Id | Name | +----+--------+ | 1 | John | | 2 | Robert | | 3 | David | +----+--------+ 3 rows in set (0.00 sec)
Following is the query to generate field in MySQL SELECT −
mysql> select Id,Name,'US' AS CountryName from DemoTable;
Output
+----+--------+-------------+ | Id | Name | CountryName | +----+--------+-------------+ | 1 | John | US | | 2 | Robert | US | | 3 | David | US | +----+--------+-------------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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