SQLServer UPDATE

UPDATE with data from another table

The examples below fill in a PhoneNumber for any Employee who is also a Customer and currently does not have a
phone number set in the Employees Table.

(These examples use the Employees and Customers tables from the Example Databases.)

Standard SQL

Update using a correlated subquery:

UPDATE
 Employees
SET PhoneNumber =
 (SELECT
 c.PhoneNumber
 FROM
 Customers c
 WHERE
 c.FName = Employees.FName
 AND c.LName = Employees.LName)
WHERE Employees.PhoneNumber IS NULL

SQL:2003

Update using MERGE:

MERGE INTO
 Employees e
USING
 Customers c
ON
 e.FName = c.Fname
 AND e.LName = c.LName
 AND e.PhoneNumber IS NULL
WHEN MATCHED THEN
 UPDATE
 SET PhoneNumber = c.PhoneNumber

SQL Server

Update using INNER JOIN:

UPDATE
 Employees
SET
 PhoneNumber = c.PhoneNumber
FROM
 Employees e
INNER JOIN Customers c
 ON e.FName = c.FName
 AND e.LName = c.LName
WHERE
 PhoneNumber IS NULL

Conclusion

In this page (written and validated by A. Gawali) you learned about SQLServer UPDATE . What's Next? If you are interested in completing SQLServer tutorial, your next topic will be learning about: SQLServer CREATE Database.

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