Oracle extract function
Extract function is used to extract year, month, or date from a date or timezone hour or timezone minute from an interval. Examples:
extract(DAY FROM DATE '2011-01-02') -- 02 extract(MONTH FROM DATE '2011-01-02') -- 01 extract(YEAR FROM DATE '2011-11-11') -- 2003
extract function was introduced in Oracle 9i and it is supported in Oracle 10g and 11g.