DROP DATABASE IF EXISTS mcs185_db;
CREATE DATABASE mcs185_db;
USE mcs185_db;
SET default_storage_engine=Columnstore;
CREATE TABLE t1 (a DATE, b DATETIME);
INSERT INTO t1 VALUES ('0-0-0', '0-0-0 0:0:0'), ('1212-12-12', '1212-12-11 11:11:11'), ('3333-03-03', '3333-3-4 3:33:33');
SHOW CREATE TABLE t1;
Table	Create Table
t1	CREATE TABLE `t1` (
  `a` date DEFAULT NULL,
  `b` datetime DEFAULT NULL
) ENGINE=Columnstore DEFAULT CHARSET=latin1
SELECT DAYNAME('1212-12-12 11:11:11');
DAYNAME('1212-12-12 11:11:11')
Wednesday
SELECT DAYNAME('2020-12-22');
DAYNAME('2020-12-22')
Tuesday
SELECT a, DAYNAME(a) FROM t1 ORDER BY 1;
a	DAYNAME(a)
0000-00-00	Sunday
1212-12-12	Wednesday
3333-03-03	Tuesday
SELECT b, DAYNAME(b) FROM t1 ORDER BY 1;
b	DAYNAME(b)
0000-00-00 00:00:00	Sunday
1212-12-11 11:11:11	Tuesday
3333-03-04 03:33:33	Wednesday
DROP DATABASE mcs185_db;