Select certain value only - mysql

Question

I have 2 table, but I wanted to query the 'rejected' status only,
means I need query the result that the user has only rejected status, instead of having approve & reject, or approve in submissions table
Users Table
-----------
id | name
-----------
1 | John
2 | Doe
3 | Testing
4 | Sample
Submission Table
-------------------------------
id | user_id | title | status
-------------------------------
1 | 1 | title1 | approved
2 | 1 | title2 | rejected
3 | 2 | title3 | approved
4 | 2 | title4 | approved
5 | 3 | title5 | rejected
6 | 3 | title6 | rejected
7 | 3 | title7 | rejected
8 | 4 | title8 | approved
9 | 4 | title9 | approved
10| 4 | title10| rejected
11| 4 | title11| rejected
Below is the result I wanted to achieve :
But I outer join the result query by 'rejected' only but still have some 'approved' result by the users.
but with above query, I'd this result.
What I wanted to query is , query the submissions just have status 'rejected' only, fully ignore the 'approved' , 'approve or reject' result.

Answer 1

I found a solution already which is using WHERE NOT EXISTS to filter the approved result in submission
SELECT u.id AS user_id,s.*, u.name
FROM submissions s
LEFT OUTER JOIN users u
ON s.user_id = u.id
WHERE NOT EXISTS (
SELECT USER_ID
FROM submissions tmp
WHERE tmp.User_ID = s.User_ID
AND tmp.status = 'approved'
)
AND STATUS = 'rejected'

Answer 2

Why did you use left outer join ? I believe simple join will get you the result ..
SELECT u.id AS user_id,s.*, u.name
FROM submissions s
JOIN users u
ON s.user_id = u.id AND s.status = 'rejected'
OR
SELECT u.id AS user_id,s.*, u.name
FROM submissions s
JOIN users u
ON s.user_id = u.id
WHERE s.status = 'rejected'

Answer 3

create table users
(id INT NOT NULL AUTO_INCREMENT PRIMARY KEY
,name VARCHAR(12) NOT NULL UNIQUE
);
INSERT INTO users VALUES
(1,'John'),
(2,'Doe'),
(3,'Testing'),
(4,'Sample');
create table submissions
(id int not null auto_increment primary key
,userid int not null
,title varchar(12) not null
,status varchar(12) not null
);
insert into submissions values
( 1,1,'title1','approved'),
( 2,1,'title2','rejected'),
( 3,2,'title3','approved'),
( 4,2,'title4','approved'),
( 5,3,'title5','rejected'),
( 6,3,'title6','rejected'),
( 7,3,'title7','rejected'),
( 8,4,'title8','approved'),
( 9,4,'title9','approved'),
(10,4,'title10','rejected'),
(11,4,'title11','rejected');
SELECT u.name
, x.*
FROM submissions x
JOIN users u
ON u.id = x.userid
LEFT
JOIN submissions y
ON y.status = 'approved'
AND y.userid = x.userid
WHERE x.status = 'rejected'
AND y.userid IS NULL;
+---------+----+--------+--------+----------+
| name | id | userid | title | status |
+---------+----+--------+--------+----------+
| Testing | 5 | 3 | title5 | rejected |
| Testing | 6 | 3 | title6 | rejected |
| Testing | 7 | 3 | title7 | rejected |
+---------+----+--------+--------+----------+
http://sqlfiddle.com/#!9/1e9da/1

Answer 4

You can use the NOT IN(your exclude criteria) format as below.
SELECT u.id AS user_id,s.*, u.name
FROM submissions s
LEFT OUTER JOIN users u
ON s.user_id = u.id
WHERE s.user_id NOT IN(
SELECT tmp.user_id
FROM submissions tmp
WHERE tmp.status = 'approved'
)
AND STATUS = 'rejected'