The UPDATE statement is used to modify the existing records in a table.
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;
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!
The following SQL statement updates the first customer (CustomerID = 1) with a new contact person and a new city.
UPDATE Customers
SET ContactName = 'Alfred Schmidt', City= 'Frankfurt'
WHERE CustomerID = 1;