Add a new column and set values in it on the basis of conditions in MySQL?

MySQLMySQLi Database

To set values on the basis of conditions, use IF() method. Let us first create a table −

mysql> create table DemoTable
   -> (
   -> Age int
   -> );
Query OK, 0 rows affected (0.55 sec)

Insert some records in the table using insert command −

mysql> insert into DemoTable values(19);
Query OK, 1 row affected (0.20 sec)

mysql> insert into DemoTable values(16);
Query OK, 1 row affected (0.10 sec)

mysql> insert into DemoTable values(17);
Query OK, 1 row affected (0.12 sec)

mysql> insert into DemoTable values(22);
Query OK, 1 row affected (0.19 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

Ouptut

This will produce the following output −

+------+
| Age  |
+------+
|   19 |
|   16 |
|   17 |
|   22 |
+------+
4 rows in set (0.00 sec)

Following is the query to set values on the basis of condition −

mysql> select Age,if(Age > 18,'You are qualified!','Sorry, you are rejected!') AS Result from
DemoTable;

Output

This will produce the following output −

+------+-------------------------+
| Age  | Result                  |
+------+-------------------------+
|   19 | You are qualified!      |
|   16 | Sorry, you are rejected!|
|   17 | Sorry, you are rejected!|
|   22 | You are qualified!      |
+------+-------------------------+
4 rows in set (0.00 sec)
raja
Published on 10-Jul-2019 14:29:24
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