Format Phone Numbers in SQL Server

Formatting should be done using your front end application. However if that option does not exist due to some reason, use the following T-SQL code to format Phone Numbers in SQL Server.

Note: The code shown below formats US Phone Numbers. I have covered three scenarios, however feel free to modify the code to add additional scenarios.

The 3 possible scenarios of a US Phone number input could be:

18052224353 will be returned as 1 (805) 222-4353
8052224353 will be returned as (805) 222-4353
2224353 will be returned as 222-4353

SELECT
phno,
CASE LEN(phno)
WHEN 11 THEN LEFT(phno,1)+
    STUFF(STUFF(STUFF(phno,1,1,' ('),6,0,') '),11,0,'-')
WHEN 10 THEN
    STUFF(STUFF(STUFF(phno,1,0,' ('),6,0,') '),11,0,'-')
WHEN 7 THEN
    STUFF(phno,4,0,'-')
ELSE 'Invalid phno'
END as formatted_phno
FROM
(
SELECT
    '18052224353' as phno union all
SELECT
    '8052224353' as phno union all
SELECT
    '888052224353' as phno union all
SELECT
    '2224353' as phno
)
as t 

The SQL Server STUFF function is used to replace certain characters with other characters, based on the position. For example STUFF(phno,1,1,'(') replaces the first character with '('. Similarly STUFF(phno,6,1,') ') inserts ') ' after position 6.

OUTPUT

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About The Author

Madhivanan,an MSc computer Science graduate from Chennai-India, works as an Assistant Project Manager at Ellaar Infotek Solutions Private Limited. He started his career as a developer working with Visual Basic 6.0, SQL Server 2000 and Crystal Report 8. As years went by, he started working more on writing queries in SQL Server. He now has good level of knowledge in SQLServer, Oracle, MySQL and PostgreSQL as well. He is also one of the leading posters at www.sqlteam.com and a moderator at www.sql-server-performance.com. His T-sql blog is at http://beyondrelational.com/blogs/madhivanan

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