Question

is there a way on how to merge result sets from different query? like for example

Query A

SELECT DISTINCT HighEnd FROM Chipset

    HighEnd
    ------------
    Class A
    Class B
    Class C

and

Query B

SELECT DISTINCT LowEnd FROM VideoCard

    LowEnd
    ------------
    Class X
    Class Y
    Class Z

and make it something like this

    CombinedSets
    ------------
    Class A
    Class B
    Class C
    Class X
    Class Y
    Class Z

Answer 1

SELECT DISTINCT HighEnd AS CombinedSets FROM Chipset
UNION
SELECT DISTINCT LowEnd AS CombinedSets FROM VideoCard

You can use UNION to combine the results. This only shows you distinct values for both. If you want duplicates, you need to use UNION ALL.