SQL and Grouping

Question

Lost in SQL on grouping. I have a table that looks like this:

start stop source
1     1    A
2     2    A
3     3    B
4     4    B
5     5    B

And I need to group it into something like this:

start stop source
1     2    A
3     5    B

The minimum number in start with the maximum number in stop for each source.

Thanks, Mike

Answer 1

You just need to add a MIN() and MAX() aggregate with a GROUP BY :

Select   Min(Start) As Start,
         Max(Stop)  As Stop,
         Source
From     YourTable
Group By Source

Answer 2

Try this:

select min(start),max(stop),source from test
group by source