PostgreSQL String() Function: Extract the last four characters of phone numbers

9. Write a query to extract the last four characters of phone numbers.

Sample Solution:

Code:

-- This SQL query retrieves the last 4 digits of the phone numbers of employees and labels the column as "Ph.No.".

SELECT RIGHT(phone_number, 4) as "Ph.No." -- Retrieves the last 4 digits of the phone numbers and labels the column as "Ph.No."
FROM employees; -- Specifies the table from which to retrieve data, in this case, the employees table

Explanation:

• This SQL query extracts the last 4 digits of the phone numbers of employees.
• The SELECT statement selects the last 4 digits of the phone numbers and labels the column as "Ph.No.".
• The RIGHT() function is used to extract the rightmost 4 characters from the phone_number column.
• The phone_number column is assumed to store phone numbers.
• The result set will contain one column labeled as "Ph.No." with the last 4 digits of the phone numbers for each employee in the employees table.

Sample table: employees

Output:

pg_exercises=# SELECT RIGHT(phone_number, 4) as "Ph.No."
pg_exercises-# FROM employees;
 Ph.No.
--------
 4567
 4568
 4569
 4560
 5567
 4561
 4562
 4563
 4564
 4567
 4568
 4565
 4566
 1934
 1834
 1734
 1634
 2034
 2019
 1834
 8009
...
 7777
 8888
 8080
 8181
(106 rows)

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