Use of Keyword "IN" in PL/SQL

Question

I have a SQL statement similar to the following:
SELECT *
FROM emailListTable
WHERE emailGroup IN ('Group1','Group2', ....)
In other words, I do not know in advance how many E-Mail Groups I will be fetching e-mail addresses for. How do I use a variable in PL/SQL to hold a variable # of groups. Is it an array? or something else.
TIA

Answer 1

This may get you on your way.
PROCEDURE Whatever( p_InVals IN varchar2 )
IS
    v_SQLList varchar2(300) := 'SELECT * ' ||
                               'FROM emailListTable ' ||
                               'WHERE emailGroup IN (' || p_InVals || ')' ;
    rAddr emailListTable%ROWTYPE;
BEGIN
    -- p_InVals validation
    OPEN csrEmailList FOR v_SQLList ;
    LOOP
        FETCH csrEmailList INTO rAddr ;
        EXIT WHEN csrEmailList%NOTFOUND;
        -- Do whatever here
    END LOOP;
END;