Checking phone numbers
As you learned in this lesson, the underscore _ symbol matches any single character.
You want to prepare a script that checks every contact_number value from the series table to get those numbers that don't start with three fives followed by a hyphen as such 555-, then three characters followed by another hyphen and finally, another four characters (555-###-####).
Can you find them?
This exercise is part of the course
Cleaning Data in SQL Server Databases
Exercise instructions
- Select the contact number.
- Get the numbers of contacts that don't match the pattern.
- Write the pattern that the numbers have to match.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
SELECT
name,
-- Contact number
___
FROM series
-- Get the numbers that don't match the pattern
WHERE contact_number ___ ___
-- Write the pattern
___