Oracle中Extract函数的用法

SELECT EXTRACT(YEAR FROM SYSDATE) FROM DUAL; return Current YearSELECT EXTRACT(MONTH FROM SYSDATE) FROM DUAL; return Current MonthSELECT EXTRACT(DAY FROM SYSDATE) FROM DUAL; return Current DaySELECT EXTRACT(HOUR FROM TIMESTAMP '2005-10-10 10:10:10') FROM DUAL;SELECT EXTRACT(MINUTE FROM TIMESTAMP '2005-10-10 10:10:10') FROM DUAL;