MySql : order by in group by takes no effect

gesanri :

I have an table like this:

CREATE TABLE `test` (
`id`  int NOT NULL AUTO_INCREMENT ,
`sale_date`  date NOT NULL ,
`store_id`  varchar(64) NOT NULL ,
`money`  decimal(10,2) NOT NULL ,
`type`  tinyint(4) NOT NULL ,
PRIMARY KEY (`id`)
);

and I insert the data as below:

2020-03-12 111 500 1
2020-03-12 111 800 2
2020-03-12 222 900 2

I want to group by sale_date and store_id，and inner group order by type desc, my sql is like this:

select * from(
select * from test order by type desc) r group by sale_date, store_id;

but the result is:

2020-03-12 111 500 1
2020-03-12 222 900 2

and the result is supposed to be like this:

2020-03-12 111 800 2
2020-03-12 222 900 2

forpas :

Use a correlated subquery:

select t.* 
from test t
where t.type = (select max(type) from test where sale_date = t.sale_date and store_id = t.store_id)

See the demo.
Results:

| id  | sale_date  | store_id | money | type |
| --- | ---------- | -------- | ----- | ---- |
| 2   | 2020-03-12 | 111      | 800   | 2    |
| 3   | 2020-03-12 | 222      | 900   | 2    |

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