Table:
0
A
B
C
D
E
1
workshop id
date
venue
name
2
1
August 18, 2007
London UK
ABC 2007
3
2
August 21, 2007
London UK
Conference 2007
4
3
August 25, 2007
New Jersey USA
Workshop 2007
5
4
October 8, 2007
New York USA
2007 qualification
6
5
January 14, 2008
New York USA
2008 qualification
7
6
July 5, 2011
Istanbul Turkey
Anual Workshop 2011

Questions and formulas:
Question: Show the date and venue in ascending alphabetical order of the venue.
Formula: SORT(UNIQUE(HSTACK(B1,C1)), 2, 1)
Formula2: SORT(UNIQUE(HSTACK(B2:B7,C2:C7)), 2, 1)
Level: medium
Question: Sort the each workshop in alphabetical order of the venue. Return the date and venue of each workshop.
Formula: SORTBY(CHOOSE({1,2},B1,C1),C1,1)
Formula2: SORTBY(CHOOSE({1,2},B2:B7,C2:C7),C2:C7,1)
Level: easy
Question: Venues from a to z on all dates.
Formula: SORT(UNIQUE(HSTACK(B1,C1)), 2, 1)
Formula2: SORT(UNIQUE(HSTACK(B2:B7,C2:C7)), 2, 1)
Level: medium
Question: Workshop venues from a to z on all dates.
Formula: SORT(UNIQUE(HSTACK(A1,C1,B1)), 2, 1)
Formula2: SORT(UNIQUE(HSTACK(A2:A7,C2:C7,B2:B7)), 2, 1)
Level: medium
Question: The venues from a to z on all dates.
Formula: SORT(UNIQUE(HSTACK(B1,C1)), 2, 1)
Formula2: SORT(UNIQUE(HSTACK(B2:B7,C2:C7)), 2, 1)
Level: medium
Question: The venues from a to z of workshops on all dates.
Formula: SORT(UNIQUE(HSTACK(A1,C1,B1)), 2, 1)
Formula2: SORT(UNIQUE(HSTACK(A2:A7,C2:C7,B2:B7)), 2, 1)
Level: medium