SQL UPDATE Keyword
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.
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":
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!