A column name is an identifier preceded by an optional correlation name. (A correlation name is usually a table name. For more information on correlation names, see FROM clause.) If a column name has characters other than letters, digits, and underscore, the name must be surrounded by quotation marks (""). For example, the following are valid column names:
employee.name address "date hired" "salary"."date paid"
For more information on Identifiers, see “Identifiers”.
