Is it possible to search a column in one sheet for all occurrences of a
search item and then put the result of that search in a single cell on a
second sheet?

For example, Sheet 1 may have something like this:

A :: B
John yellow
Mary yellow
Sue red
Richard green
Michael yellow

In the second sheet, I have a row for each color, and I want to put in, say,
H1, the names in Sheet 1 that have that color in column B.

C :: H
yellow John, Mary, Michael

So, say I have "yellow" in B1, I want the spreadsheet to put in H1 the name
of each person in Column A, separated with a comma and space, in Sheet 1 who
has that color in Column B.

It's possible there may be NO occurences, ONE occurence, or MORE THAN ONE
occurence, which makes it even more difficult because I only need
commas/spaces for MORE THAN ONE occurence.

Thanks!!!!