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MySQL SELECT to add a new column to a query and give it a value?
To add column to MySQL query and give it a value, use the below syntax −
select yourColumnName1,yourColumnName2,.....N ,yourValue AS anyAliasName from yourTableName;
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20) ); Query OK, 0 rows affected (0.84 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(FirstName) values('John');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable(FirstName) values('Larry');
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable(FirstName) values('Chris');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(FirstName) values('Robert');
Query OK, 1 row affected (0.15 sec)Following is the query to display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+-----------+ | Id | FirstName | +----+-----------+ | 1 | John | | 2 | Larry | | 3 | Chris | | 4 | Robert | +----+-----------+ 4 rows in set (0.00 sec)
Following is the query to add column to MySQL and give it a value. Here we have set the value 23 after creating a new column AGE −
mysql> select Id,FirstName,23 AS AGE from DemoTable;
This will produce the following output −
+----+-----------+-----+ | Id | FirstName | AGE | +----+-----------+-----+ | 1 | John | 23 | | 2 | Larry | 23 | | 3 | Chris | 23 | | 4 | Robert | 23 | +----+-----------+-----+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
12K+ Views
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