Update
The UPDATE command is used to update existing rows in a table.
The following SQL statement updates the first customer (CustomerID = 1) with a new contact person and a new city.
Example
UPDATE Customers
SET ContactName = 'Alfred Schmidt', City= 'Frankfurt'
WHERE CustomerID = 1;The following SQL statement will update the contactname to "Juan" for all records where country is "Mexico":
Example
UPDATE Customers
SET ContactName='Juan'
WHERE Country='Mexico';Note
Be careful when updating records in a table! Notice the WHERE clause in the UPDATE statement. The WHERE clause specifies which record(s) that should be updated. If you omit the WHERE clause, all records in the table will be updated!