CREATE DATABASE db;
CREATE TABLE db.t1 (a INT);
CREATE USER 'user'@'%';

--echo # `\db` should be decoded as `db` ...
GRANT SELECT ON `\db`.* TO 'user'@'%';

--echo # ... but it is not:
SHOW GRANTS FOR 'user'@'%';

--echo # this should duplicate previous grant ...
GRANT SELECT ON db.* TO 'user'@'%';

--echo # ... but it doesn't, there are 2 different privileges:
SHOW GRANTS FOR 'user'@'%';

--echo # this should revoke all grants on both `db` and `\db` if any
REVOKE ALL ON db.* FROM 'user'@'%';

--echo # ... but it removes only grants on `db`:
SHOW GRANTS FOR 'user'@'%';

--echo # connect with username "user"
connect (conn1,localhost,user,,);
connection conn1;
--echo # here should be an access error:
SELECT * FROM db.t1;
disconnect conn1;

connection default;
DROP USER 'user'@'%';
DROP DATABASE db;