Question

I have a table of data with a Name, a Grade, and a Point. For example, “John” got the grade B, which has a point value of 3.0.

How can I select entries that are less than a grade of “B”?

So I somehow need to do something like this

Value = select Point from MyTable where Grade="B"

and then

select * from MyTable where Point < value

but obviously SQL has to be one statement…

Answer 1

Try it use in subquery as below:

select * 
from MyTable 
where Point < (select Point 
               from MyTable 
               where Grade="B")

but if you subquery returns more than one row try to use aggregate funcion for example min

select * 
from MyTable 
where Point < (select min(Point)
               from MyTable 
               where Grade="B")

or with LIMIT and join:

select * 
from MyTable mt
join (select Point from MyTable 
      where Grade="B"
      order by Point
      LIMIT 1) mt2 on mt.Point < mt2.Point