DROP DATABASE IF EXISTS mcs232_db;
CREATE DATABASE mcs232_db;
USE mcs232_db;
CREATE TABLE t1(t1_d DATE, t1_t TIME, t1_dt DATETIME)ENGINE=Columnstore;
INSERT INTO t1 VALUES(NULL, NULL, NULL);
INSERT INTO t1 VALUES('2222-11-11', '12:12:12', '2020-11-11 12:12:12');
INSERT INTO t1 VALUES('2020-01-01', '11:37:21', '2020-12-31 12:34:56');
INSERT INTO t1 VALUES('2016-02-01', '03:41:19', '2017-02-01 12:12:12');
SELECT t1_d, SECOND(t1_d) FROM t1 ORDER BY 1;
t1_d	SECOND(t1_d)
NULL	NULL
2016-02-01	0
2020-01-01	0
2222-11-11	0
SELECT t1_t, SECOND(t1_t) FROM t1 ORDER BY 1;
t1_t	SECOND(t1_t)
NULL	NULL
03:41:19	19
11:37:21	21
12:12:12	12
SELECT t1_dt, SECOND(t1_dt) FROM t1 ORDER BY 1;
t1_dt	SECOND(t1_dt)
NULL	NULL
2017-02-01 12:12:12	12
2020-11-11 12:12:12	12
2020-12-31 12:34:56	56
DROP DATABASE mcs232_db;