DROP DATABASE IF EXISTS mcs191_db;
CREATE DATABASE mcs191_db;
USE mcs191_db;
CREATE TABLE t1 (a INT, b CHAR(5))ENGINE=Columnstore;
INSERT INTO t1 VALUES (NULL, NULL),(1, 'aaa'),(2, 'aaa'),(1, 'ccc'),(4, 'ddd'),(5, 'aaa'),(6, 'ddd'),(7, 'eee');
SELECT MIN(DISTINCT a) FROM t1;
MIN(DISTINCT a)
1
SELECT MIN(DISTINCT a) FROM t1 GROUP BY b HAVING b = 'aaa';
MIN(DISTINCT a)
1
SELECT b, MIN(DISTINCT a) FROM t1 GROUP BY b ORDER BY b DESC;
b	MIN(DISTINCT a)
eee	7
ddd	4
ccc	1
aaa	1
NULL	NULL
SELECT MIN(a) FROM t1;
MIN(a)
1
DROP DATABASE mcs191_db;