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  3. Cleaning Data in SQL Server Databases

Exercise

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?

Instructions

100 XP
  • Select the contact number.
  • Get the numbers of contacts that don't match the pattern.
  • Write the pattern that the numbers have to match.