MySQL如何让GRANT扮演角色？它们仅对用户有效

Question

如果我将SELECT授予用户，则没有问题，但是如果我将SELECT授予角色，然后又将角色授予用户SELECT查询不起作用，即使使用'role'的'user'的SHOW GRANTS显示该用户有权选择

-以root身份

create role 'seller';
grant select on pharmacy.sells to 'seller';
create user 'seller1'@'localhost' identified by '1';
grant 'seller' to 'seller1'@'localhost'

-现已成为Seller1

select * from pharmacy.sells

--Error Code: 1142. SELECT command denied to user 'seller1'@'localhost' for table 'sells'

show grants for 'seller1'@'localhost' using 'seller'

--GRANT USAGE ON *.* TO `seller1`@`localhost`

--GRANT SELECT ON `pharmacy`.`sells` TO `seller1`@`localhost`

--GRANT `seller`@`%` TO `seller1`@`localhost`

-以root身份

grant select on pharmacy.sells to 'seller1'@'localhost'

-作为卖方1

select * from pharmacy.sells

-有效

-show Grants显示相同的内容