Using subqueries

I believe that I need to use a subquery to find a solution to my little problem, but it's been so long since I took my DB class that I don't remember too much.

I have a table to which we can call personprogram. This table contains among other data, status, category, id, etc. What I want to find out, are persons who have more than one program in their record:

PersonID   Category   Status
100             1                 1
100             2                 1
101             2                 1
102             1                 1
102             2                 1

So my query would only return two IDs, 100 and 102.

Not sure if a subquery is needed or a group by or having, Need to take a refresher course obviously. Thanks!
Horalia RodriguezIT DeveloperAsked:
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John EastonDirectorCommented:
I think you are looking for something like the following:
SELECT PersonID FROM (SELECT PersonID, Count(*) AS Tot FROM personprogram GROUP BY PersonID) WHERE Tot > 1;

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No subqueries needed in this case:
SELECT PersonID, count(PersonId) AS Tot FROM personprogram GROUP BY PersonID HAVING Tot >1

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