Remove unforgeted records - mysql

Question

I have two tables
CREATE TABLE `server` (
`server_id` int(3) NOT NULL AUTO_INCREMENT,
`server_name` varchar(15),
`server_alias` varchar(50),
`server_status` tinyint(1) DEFAULT '0',
`server_join` tinyint(1) DEFAULT '1',
`server_number_member` int(5),
PRIMARY KEY (`server_id`)
) ENGINE=MyISAM AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
CREATE TABLE `member` (
`member_id` int(11) NOT NULL AUTO_INCREMENT,
`member_server` int(3) DEFAULT NULL COMMENT 'Id server',
`member_name` varchar(20) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT 'Tên của member',
PRIMARY KEY (`member_id`)
) ENGINE=MyISAM AUTO_INCREMENT=4 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
An I create table VIEW to get list server
CREATE VIEW `server_client` AS
SELECT
`s`.`server_id` AS `server_id`,
`s`.`server_name` AS `server_name`,
`s`.`server_alias` AS `server_alias`,
IF (`s`.`server_join` = 1, (COUNT(`m`.`member_id`) / `s`.`server_number_member` * 100) DIV 1, 100) AS `server_full`
FROM (`server` `s`
LEFT JOIN `member` `m`
ON ((`m`.`member_server` = `s`.`server_id`)))
WHERE `s`.`server_status` = 1
Now, server table have 1 record:
-------------------------------------------------------------------------------------------
|server_id|server_name|server_alias |server_status|server_join|server_number_member|
|-----------------------------------------------------------------------------------------|
| 1 | SV 01 | http://example.com/ | 0 | 0 | 10 |
-------------------------------------------------------------------------------------------
In membertable
------------------------------------------
| member_id | member_server | member_name|
|----------------------------------------|
| 1 | 1 | aaa |
|----------------------------------------|
| 2 | 1 | bbb |
|----------------------------------------|
| 3 | 1 | ccc |
------------------------------------------
Result in server_client table
--------------------------------------------------------
| server_id | server_name | server_alias | server_full |
|------------------------------------------------------|
| NULL | NULL | NULL | 100 |
--------------------------------------------------------
server_full is used to calculate the percentage of the number of members already in a server
I want to remove record NULL in server_client table
How to do it
Thank

Answer 1

Because you are using COUNT() you should also be aggregating over the servers with GROUP BY. The following query should be along the lines of what you want:
CREATE VIEW server_client AS
SELECT
s.server_id AS server_id,
s.server_name AS server_name,
s.server_alias AS server_alias,
IF (s.server_join = 1,
(COUNT(m.member_id) / s.server_number_member * 100) DIV 1,
100) AS server_full
FROM server s
LEFT JOIN member m
ON m.member_server = s.server_id
WHERE s.server_status = 1
GROUP BY
s.server_id,
s.server_name,
s.server_alias
The only issue you may have is with the sum conditional aggregation I have in my query. In any case, I expect that the results from the above will at least start looking correct.
By the way, I removed all the backticks because you don't them and they are ugly.