SAP HANA的常用函数（时间类函数）

SELECT ADD_DAYS(TO_DATE('2015-10-20','YYYY-MM-DD'),30) "add days" FROM DUMMY;
SELECT ADD_MONTHS(TO_DATE('2015-10-20','YYYY-MM-DD'),1) "add months" FROM DUMMY;
SELECT ADD_SECONDS(TO_TIMESTAMP('2015-10-21 23:30:45'),60*30) "add seconds" FROM DUMMY;
SELECT ADD_YEARS(TO_DATE('2009-12-05','YYYY-MM-DD'), 1) "add years" FROM DUMMY;
SELECT CURRENT_DATE "current date" FROM DUMMY;
SELECT CURRENT_TIMESTAMP "current timestamp" FROM DUMMY;
SELECT DAYNAME('2015-10-20') "dayname" FROM DUMMY;
SELECT DAYOFMONTH('2011-05-30') "dayofmonth" FROM DUMMY;
SELECT DAYOFYEAR('2011-05-30') "dayofyear" FROM DUMMY;
SELECT DAYS_BETWEEN(TO_DATE('2009-12-05','YYYY-MM-DD'), TO_DATE('2010-01-05', 'YYYY-MM-DD')) "days between" FROM DUMMY;
SELECT EXTRACT (YEAR FROM TO_DATE ('2010-01-04', 'YYYY-MM-DD')) "extract" FROM DUMMY;
SELECT HOUR ('2010-01-04 12:34:56') "hour" FROM DUMMY;
SELECT ISOWEEK(TO_DATE('2011-05-30','YYYY-MM-DD')) "isoweek" FROM DUMMY;
SELECT LAST_DAY (TO_DATE('2010-01-04', 'YYYY-MM-DD')) "last day" FROM DUMMY;
SELECT MINUTE ('2010-01-04 12:34:56') "minute" FROM DUMMY;
SELECT MONTH ('2011-05-30') "month" FROM DUMMY;
SELECT MONTHNAME ('2011-10-30') "monthname" FROM DUMMY;
SELECT NEXT_DAY (TO_DATE ('2009-12-31', 'YYYY-MM-DD')) "next day" FROM DUMMY;
SELECT NOW() "now" FROM DUMMY;
SELECT QUARTER (TO_DATE('2015-04-01', 'YYYY-MM-DD'), 4) "quarter" FROM DUMMY;
SELECT SECOND ('2015-04-01 12:34:56') "second" FROM DUMMY;
SELECT SECONDS_BETWEEN ('2009-12-31', '2010-01-01') "seconds between" FROM DUMMY;
SELECT WEEK (TO_DATE('2011-05-30', 'YYYY-MM-DD')) "week" FROM DUMMY;
SELECT WEEKDAY (TO_DATE ('2015-10-20', 'YYYY-MM-DD')) "week day" FROM DUMMY;
SELECT YEAR (TO_DATE ('2011-05-30', 'YYYY-MM-DD')) "year" FROM DUMMY;