CREATE TABLE t1(c1 TIME NOT NULL, c2 TIME NULL, c3 DATE, PRIMARY
KEY(c1), UNIQUE INDEX(c2));
insert into t1 values('-838:59:59','-838:59:59','2009-01-21');
insert into t1 values('00:00:00','00:00:00','2009-01-09');
insert into t1 values('00:00:11','00:00:11','2009-01-20');
insert into t1 values('00:00:12','00:00:12','2009-01-13');
insert into t1 values('00:00:45','00:00:45','2009-01-07');
insert into t1 values('00:11:12','00:11:12','2009-01-19');
insert into t1 values('00:12:30','00:12:30','2009-01-23');
insert into t1 values('00:12:34','00:12:34','2009-01-14');
insert into t1 values('01:23:00','01:23:00','2009-01-03');
insert into t1 values('08:03:02','08:03:02','2009-01-18');
insert into t1 values('08:29:45',NULL,'2009-02-01');
insert into t1 values('09:00:45','09:00:45','2009-01-24');
insert into t1 values('09:36:00','09:36:00','2009-01-25');
insert into t1 values('10:00:00','10:00:00','2009-01-06');
insert into t1 values('10:11:12','10:11:12','2009-01-11');
insert into t1 values('10:22:33','10:22:33','2009-01-02');
insert into t1 values('11:11:12','11:11:12','2009-01-12');
insert into t1 values('11:11:27','11:11:27','2009-01-17');
insert into t1 values('12:34:56','12:34:56','2009-01-01');
insert into t1 values('12:34:58','12:34:58','2009-01-15');
insert into t1 values('12:35:56','12:35:56','2009-01-16');
insert into t1 values('491:22:33','491:22:33','2009-01-04');
insert into t1 values('825:23:00','825:23:00','2009-01-05');
insert into t1 values('838:59:59','838:59:59','2009-01-21');
SELECT * FROM t1 WHERE c2 <> NULL ORDER BY c2 DESC;
c1	c2	c3
SELECT * FROM t1 WHERE c2 <> NULL ORDER BY c2 DESC LIMIT 2;
c1	c2	c3
drop table t1;