mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 02:46:29 +01:00
15 lines
436 B
Text
15 lines
436 B
Text
--source include/have_innodb.inc
|
|
|
|
#
|
|
# MDEV-4925 Wrong result - count(distinct), Using index for group-by (scanning)
|
|
#
|
|
CREATE TABLE t1 (
|
|
id int NOT NULL AUTO_INCREMENT,
|
|
a int NOT NULL,
|
|
b int NOT NULL,
|
|
PRIMARY KEY (id),
|
|
UNIQUE KEY ba (b, a)
|
|
) ENGINE=InnoDB;
|
|
INSERT INTO t1 (a, b) VALUES(1,101),(1,102),(1,103),(1,104),(1,105),(1,106),(1,107),(1,108),(1,109),(1,110);
|
|
SELECT COUNT(DISTINCT b) FROM t1 WHERE a = 1;
|
|
DROP TABLE t1;
|