The Java EE 6 Tutorial, Volume I

Update and Delete Statements

Update and delete statements provide bulk operations over sets of entities. They have the following syntax:

update_statement :: = update_clause [where_clause] delete_statement :: = 
		delete_clause [where_clause]

The update and delete clauses determine the type of the entities to be updated or deleted. The WHERE clause may be used to restrict the scope of the update or delete operation.