SQL SET Keyword
SET command is used with UPDATE to specify which columns and values that should be updated
in a table.
The following SQL updates the first customer (CustomerID = 1) with a new ContactName and a new City:
SET ContactName = 'Alfred Schmidt', City= 'Frankfurt'
WHERE CustomerID = 1;
The following SQL will update the "ContactName" field 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!