How to extract the area codes from a phone number with MySQL?

Let’s say we have a list of phone numbers and from that we want to get the area codes. These area codes are for example, the first 3 digits of the phone number. Use LEFT() function from MySQL for this.

Let us first create a table −

mysql> create table DemoTable
-> (
-> AreaCodes varchar(100)
-> );
Query OK, 0 rows affected (0.62 sec)

Insert some records in the table using insert command. Here, let’s say we have included the phone numbers −

mysql> insert into DemoTable values('90387568976') ;
Query OK, 1 row affected (0.20 sec)

mysql> insert into DemoTable values('90389097878' ;
Query OK, 1 row affected (0.23 sec)

mysql> insert into DemoTable values('56789008799');
Query OK, 1 row affected (0.10 sec)

mysql> insert into DemoTable values('45679008571');
Query OK, 1 row affected (0.23 sec)

mysql> insert into DemoTable values('45679008536);
Query OK, 1 row affected (0.12 sec)

Display all records from the table using select statement −

mysql> select *from DemoTable;

This will produce the following output −

+------------+
| AreaCodes  |
+------------+
| 90387568976|
| 90389097878|
| 56789008799|
| 45679008571|
| 45679008536|
+------------+
5 rows in set (0.00 sec)

Following is the query to get the available area codes −

mysql> select distinct LEFT(AreaCodes,4) from DemoTable

This will produce the following output −

+-------------------+
| left(AreaCodes,4) |
+-------------------+
| 9038              |
| 5678              |
| 4567              |
+-------------------+
3 rows in set (0.13 sec)