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mirror of https://github.com/mariadb-corporation/mariadb-columnstore-engine.git synced 2025-05-27 01:57:30 +03:00

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DROP DATABASE IF EXISTS mcs188_db;
CREATE DATABASE mcs188_db;
USE mcs188_db;
CREATE TABLE t1 (a INT, b CHAR(5))ENGINE=Columnstore;
INSERT INTO t1 VALUES (NULL, ''),(1, 'aaa'),(2, 'aaa'),(1, 'ccc'),(4, 'ddd'),(5, 'aaa'),(6, 'ddd'),(7, 'eee');
SELECT AVG(DISTINCT a) FROM t1;
AVG(DISTINCT a)
4.1667
SELECT AVG(DISTINCT a) FROM t1 GROUP BY b HAVING b = 'aaa';
AVG(DISTINCT a)
2.6667
SELECT b, AVG(DISTINCT a) FROM t1 GROUP BY b ORDER BY b DESC;
b AVG(DISTINCT a)
eee 7.0000
ddd 5.0000
ccc 1.0000
aaa 2.6667
NULL NULL
SELECT AVG(a) FROM t1;
AVG(a)
3.7143
DROP DATABASE mcs188_db;