DROP DATABASE IF EXISTS mcs97_db;
CREATE DATABASE mcs97_db;
USE mcs97_db;
CREATE TABLE t1 (a INT, b CHAR(5))ENGINE=Columnstore;
INSERT INTO t1 VALUES (NULL, ''),(1, 'aaa'),(2, 'aaa'),(3, 'ccc'),(4, 'ddd'),(5, 'aaa'),(6, 'ddd'),(7, 'eee');
SELECT GROUP_CONCAT(a) FROM t1;
GROUP_CONCAT(a)
1,2,3,4,5,6,7
SELECT GROUP_CONCAT(a SEPARATOR ';') FROM t1 ORDER BY a DESC;
GROUP_CONCAT(a SEPARATOR ';')
1;2;3;4;5;6;7
SELECT GROUP_CONCAT(a ORDER BY a DESC SEPARATOR ';') FROM t1;
GROUP_CONCAT(a ORDER BY a DESC SEPARATOR ';')
7;6;5;4;3;2;1
SELECT GROUP_CONCAT(b) FROM t1;
GROUP_CONCAT(b)
aaa,aaa,ccc,ddd,aaa,ddd,eee
SELECT GROUP_CONCAT(DISTINCT b SEPARATOR ';') FROM t1 ORDER BY b ASC;
GROUP_CONCAT(DISTINCT b SEPARATOR ';')
eee;ccc;ddd;aaa
SELECT GROUP_CONCAT(b ORDER BY b DESC SEPARATOR ';') FROM t1;
GROUP_CONCAT(b ORDER BY b DESC SEPARATOR ';')
eee;ddd;ddd;ccc;aaa;aaa;aaa
DROP DATABASE mcs97_db;