select column value by custom priority - mysql

Question

Mysql 5.7
I have a table with 3 columns
ID -> Primary Key
STATUS -> User Status
MASTERID -> Foreign Key
I need a select query which will return a Status of the user using below priority
Verified -> 1 has the highest priority
Reset -> 2 the second priority
Created -> 3 has the least priority
ID STATUS MASTERID
1 Created 1
2 Verified 1
3 Reset 1
4 Created 1
select query should return Verified
ID STATUS MASTERID
1 Reset 1
2 Reset 1
select query should return Reset as there is only one distinct status present
ID STATUS MASTERID
1 Reset 1
2 Created 1
3 Verified 1
select query should return Verified as it has the highest priority
above records are an example of one user, likewise I need to fetch the status of each distinct user

Answer 1

Use order by with field():
select t.*
from (select t.*,
row_number() over (partition by masterid order by field(status, 'Verified', 'Reset', 'Created') as seqnum
from t
) t
where seqnum = 1;
If you only want the result for one master id:
select t.*
from t
where masterid = 1
order by field(status, 'Verified', 'Reset', 'Created')
limit 1;
Of course, for the values that you have specified, you could replace field() with status desc. However, this offers the more general solution.
EDIT:
In MySQL 5.7, you can use:
select t.*
from t
where t.id = (select t2.id
from t t2
where t2.masterid = t.masterid
order by field(status, 'Verified', 'Reset', 'Created')
limit 1
);

Answer 2

I am assuming that MASTERID is the user and I have taken the liberty of creating some sample data. But really the OP (and that is you) should be the one creating the sample tables and data on a website such as db-fiddle.com if you are seriously looking for someone to answer your questions in the future. See Why should I provide a Minimal Reproducible Example for a very simple SQL query?.
SELECT MASTERID,
CASE
WHEN RANKING = 1 THEN 'Created'
WHEN RANKING = 2 THEN 'Reset'
WHEN RANKING = 3 THEN 'Verified'
END as STATUS
FROM (
SELECT MASTERID, MAX(FIELD(STATUS, 'Created', 'Reset', 'Verified')) as RANKING
FROM mytable
GROUP bY MASTERID
) SQ;
| MASTERID | STATUS |
| -------- | -------- |
| 1 | Verified |
| 2 | Reset |
| 3 | Verified |
View on DB Fiddle
If you want to also have an associated ID with the returned results, then:
SELECT * FROM mytable t1
WHERE FIELD(STATUS, 'Created', 'Reset', 'Verified') = (
SELECT MAX(FIELD(STATUS, 'Created', 'Reset', 'Verified')) FROM mytable t2
WHERE t2.MASTERID = t1.MASTERID
) AND t1.ID = (
SELECT MIN(t2.ID) FROM mytable t2
WHERE t2.MASTERID = t1.MASTERID AND t2.STATUS = t1.STATUS
)
| ID | STATUS | MASTERID |
| --- | -------- | -------- |
| 2 | Verified | 1 |
| 5 | Reset | 2 |
| 9 | Verified | 3 |
View on DB Fiddle