MySQL Conditioning Query - mysql

Question

I was trying with writing a query to select a row from the table (attached screenshot). This is something peculiar, where * means any value. I need to select a row where Amount should be between Start Amount and End Amount and Department should be IT.
The condition for Country and Sub Department is a bit tricky. If the selected country is not in the Country column then the query should return me the record with * and same is the case with sub department.
I tried with a approach of selecting columns based on Department and amount like this
Select * from table_name where Department = 'IT'
and 1000 BETWEEN Start Amount AND End Amount
But, after this I am not sure how to get the result with below condition.
If country is not India then all * results I should get.

Answer 1

I believe you want something like:
SELECT *
FROM table_name
WHERE Department = 'IT'
AND 1000 BETWEEN `Start Amount` AND `End Amount`
AND country IN ('India','*')
AND `Sub Department` IN ('SD2','*')
ORDER BY country = 'India' DESC,
`Sub Department` = 'SD2' DESC
LIMIT 1

Answer 2

Use a union all to assign a group number in order of preference to every permitted combination of country/sub_department i.e. (India,SD1) (India,*) (*,*) then only select the rows with the lowest group number.
select t1.* from (
Select t1.* ,
if(#minGroup > groupNumber, #minGroup := groupNumber, #minGroup) minGroupNumber
from (
Select t1.*, 1 groupNumber from table_name t1
where Department = 'IT'
and 1000 BETWEEN `Start Amount` AND `End Amount`
and country = 'India'
and sub_department = 'SD1'
union all
Select t1.*, 2 groupNumber from table_name t1
where Department = 'IT'
and 1000 BETWEEN `Start Amount` AND `End Amount`
and country = 'India'
and sub_department = '*'
union all
Select t1.*, 3 groupNumber from table_name t1
where Department = 'IT'
and 1000 BETWEEN `Start Amount` AND `End Amount`
and country = '*'
and sub_department = '*'
) t1 cross join (select #minGroup := 3) t2
) t1 where groupNumber = #minGroup

Answer 3

Re-sending bcz, star is truncated
Select NVL(tc.Country, '*') Country_Column_name,
NVL(tsd.Sub_Dept, '*') Sub_Dept_Column_name
from table_name tn
LEFT OUTER JOIN table_country tc
ON tn.Country = tc.Country
LEFT OUTER JOIN table_sub_dept tsd
ON tn.Sub Dept = tsd.Sub Dept
where Department = 'IT'
and 1000 BETWEEN Start Amount AND End Amount
Note: Country & Sub Dpt table should have unique column and that should be used in the join.