SELECT clause with self joining table

Question

Two tables:

//SKILL
SNAME
---------------------
C++
C#
C
JAVA

//REQUIRED
SNAME          REQUIRED
------------------------
C++               C
C#                     


        

Answer 1

Use CTE to make it generic. Levels may go deeper than just 2. Use the following query to get required result.

with cte
As
(
Select SName, [Required] from courses where SName = 'C++'
Union All
Select courses.SName, courses.[Required] from courses 
   inner join cte on courses.SName = cte.[Required]
)
select * from cte

Hope it helps.