Same column with multiple condtitions in SQL

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Hi Team,

Here is the query.

Select grade as g1, grade as g2 from Student where
(Marks > 75 and Marks <90) -- for g1
or (Marks > 40 and Marks <75) for g2

I want to display the single column with multiple condition in where clause.

Here grade is single column.

Could you please suggest how to proceed further.

What I have tried:

Tried sub queries which is hitting performance like anything.

Posted 30-Jun-22 4:09am

nsvrao

Updated 30-Jun-22 4:28am

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Wendelius · Answer 1 · 2022-06-30T04:28:00

Solution 1

If I understood your question correctly perhaps something like

SQL

select 
   case 
      when marks > 75 and marks < 90 then grade
      else null
   end as g1,
   case 
      when marks > 40 and marks <= 75 then grade
      else null
   end as g2
from student 
where marks > 40 and marks < 90

Posted 30-Jun-22 4:28am

Wendelius

Comments

nsvrao 30-Jun-22 12:17pm

Either of grade column is becoming NULL with the above query.

Wendelius 30-Jun-22 14:24pm

Any example data?

nsvrao 1-Jul-22 2:28am

select
case
when ((marks > 75 and marks < 90) and (marks > 50 and marks < 75)) then grade
else null
end as g1,
case
when ((marks > 40 and marks <= 50)and (marks > 30 and marks <= 40)) then grade
else null
end as g2
from student
where marks --- wanted to know what will be exact condition to be placed in where condition

Wendelius 1-Jul-22 13:54pm

Do you have any example data to try with?