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START TRANSACTION
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DROP DATABASE IF EXISTS `base`
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CREATE DATABASE IF NOT EXISTS `base`
DEFAULT CHARACTER SET `latin1`
DEFAULT COLLATE `latin1_general_ci`
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DROP TABLE IF EXISTS `test`
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create table `test`
( `id` integer unsigned not null auto_increment primary key,
`val` integer not null,
`date` date not null
) ENGINE=InnoDB
DEFAULT CHARSET=`latin1` COLLATE=`latin1_general_ci`
ROW_FORMAT=COMPRESSED
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insert into `test` (`val`,`date`) values
(1, '2020-07-01'),
(2, '2020-07-05'),
(3, '2020-07-08'),
(1, '2020-07-02'),
(2, '2020-07-06'),
(2, '2020-07-03'),
(3, '2020-07-07')
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select * from `test`
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+----+-----+------------+
| id | val | date |
+----+-----+------------+
| 1 | 1 | 2020-07-01 |
| 2 | 2 | 2020-07-05 |
| 3 | 3 | 2020-07-08 |
| 4 | 1 | 2020-07-02 |
| 5 | 2 | 2020-07-06 |
| 6 | 2 | 2020-07-03 |
| 7 | 3 | 2020-07-07 |
+----+-----+------------+
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commit
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drop view if exists `req_1`
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create view `req_1` as
select val, count(*) as nbre
from `test`
where date between '2020-07-01' and '2020-07-06'
group by val
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select * from req_1
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+-----+------+
| val | nbre |
+-----+------+
| 1 | 2 |
| 2 | 3 |
+-----+------+
--------------
select val
from req_1
where nbre = ( select max(nbre) from req_1 )
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+-----+
| val |
+-----+
| 2 |
+-----+
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COMMIT
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