mariadb-columnstore-engine/mysql-test/columnstore/basic/r/mcs37_select_distinct.result

DROP DATABASE IF EXISTS mcs37_db;
CREATE DATABASE mcs37_db;
USE mcs37_db;
CREATE TABLE t1(col1 INT, col2 CHAR(5))ENGINE=Columnstore;
INSERT INTO t1 VALUES(NULL,''),(1,'a'),(1,'b'),(1,'c'),(2,'dd'),(3,'eee');
SELECT COUNT(DISTINCT col1) FROM t1;
COUNT(DISTINCT col1)
3
SELECT COUNT(DISTINCT col2) FROM t1;
COUNT(DISTINCT col2)
5
SELECT DISTINCT col1 FROM t1;
col1
NULL
1
2
3
SELECT DISTINCT col1 FROM t1 ORDER BY col1 DESC;
col1
3
2
1
NULL
SELECT DISTINCT col2 FROM t1;
col2
NULL
a
b
c
dd
eee
CREATE TABLE t2(col1 INT)ENGINE=Columnstore;
INSERT INTO t2 SELECT DISTINCT col1 FROM t1;
SELECT * FROM t2;
col1
NULL
1
2
3
CREATE TABLE t3 (name varchar(255));
INSERT INTO t3 VALUES ('aa'),('ab'),('ac'),('ad'),('ae');
SELECT DISTINCT * FROM t3;
name
aa
ab
ac
ad
ae
SELECT DISTINCT name FROM t3 LIMIT 2;
name
aa
ab
SELECT DISTINCT 1 FROM t3 LIMIT 3;
1
1
DROP DATABASE mcs37_db;