Question

I am using SQL Server 2008. I have two sql queries

select Course 
from StudentDB.dbo.Student 
where RollNo = 130

and

select Course 
from StudentDB.dbo.Courses 
where Course is not null

First query will return the following value

MSc

and the second query will return

MCA
MSc
CSE
ECE
EEE

I need to join these queries and want an output like this

MSc
MCA
CSE
ECE
EEE

That is appending the result of second query to the first query and removing the duplicate value.

Please note I need result of first query on the top of the result. Here Msc is the first value because it is the result of first query. I tried union. But it returns the result of the second query itself. So union of those queries won’t helps.

Answer 1

I’m not a fan of DISTINCT; working from JW’s answer, this will give you the distinct list of values ordered with values from StudentDB.dbo.Student first:

SELECT Course
FROM
(
    select Course, 1 ord from StudentDB.dbo.Student where RollNo = 130
    UNION
    select Course, 2 ord from StudentDB.dbo.Courses where Course is not null
) s
GROUP BY Course
ORDER BY min(ord)