How to use alias in MySQL select query?

To set alias or alternate name in MySQL, you need to use the AS keyword. Let us first create a table −

mysql> create table DemoTable
(
   Name varchar(100)
);
Query OK, 0 rows affected (0.51 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values('Chris');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('Adam');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('David');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Robert');
Query OK, 1 row affected (0.14 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+--------+
| Name   |
+--------+
| Chris  |
| Adam   |
| David  |
| Robert |
+--------+
4 rows in set (0.00 sec)

Following is the query to set alias in MySQL select query −

mysql> select Name AS FirstName from DemoTable;

This will produce the following output −

+-----------+
| FirstName |
+-----------+
| Chris     |
| Adam      |
| David     |
| Robert    |
+-----------+
4 rows in set (0.00 sec)