Table:
0
A
B
C
D
E
F
G
1
book club id
year
author or editor
book title
publisher
category
result
2
1
1989
Michael Nava
Goldenboy
Alyson
Gay M/SF
Won [A ]
3
2
1989
Donald Ward
Death Takes the Stage
St. Martin's Press
Gay M/SF
Nom
4
3
1989
Michael Bishop
Unicorn Mountain
William Morrow
Gay M/SF
Nom
5
4
1989
Joseph Hansen
Obedience
Mysterious Press
Gay M/SF
Nom
6
5
1989
George Baxt
Whoӳ Next
International Polygonics
Gay M/SF
Nom
7
6
1989
Antoinette Azolakov
Skiptrace
Banned Books
Lesb. M/SF
Won
8
7
1989
Claire McNab
Lessons In Murder
Naiad Press
Lesb. M/SF
Nom
9
8
1989
Judy Grahn
Mundaneӳ World
Crossing Press
Lesb. M/SF
Nom
10
9
1989
Dolores Klaich
Heavy Gilt
Naiad Press
Lesb. M/SF
Nom
11
10
1989
Sandy Bayer
The Crystal Curtain
Alyson
Lesb. M/SF
Nom
12
11
1990
Jeffrey N. McMahan
Somewhere in the Night
Alyson
Gay SF/F
Won [B ]
13
12
1990
Thom Nickels
Walking Water / After All This
Banned Books
Gay SF/F
Nom

Questions and formulas:
Question: How many book clubs are there?
Formula: SUM(A1)
Formula2: SUM(A2:A13)
Level: easy
Question: Count the number of book clubs.
Formula: SUM(A1)
Formula2: SUM(A2:A13)
Level: easy
Question: show the titles, and authors or editors for all books made after the year 1989.
Formula: CHOOSE({1,2},FILTER(D1,B1>1989),FILTER(C1,B1>1989))
Formula2: CHOOSE({1,2},FILTER(D2:D13,B2:B13>1989),FILTER(C2:C13,B2:B13>1989))
Level: medium
Question: What are the titles and authors or editors that correspond to books made after 1989?
Formula: CHOOSE({1,2},FILTER(D1,B1>1989),FILTER(C1,B1>1989))
Formula2: CHOOSE({1,2},FILTER(D2:D13,B2:B13>1989),FILTER(C2:C13,B2:B13>1989))
Level: medium
Question: Show all distinct publishers for books.
Formula: UNIQUE(E1)
Formula2: UNIQUE(E2:E13)
Level: easy
Question: What are all the different book publishers?
Formula: UNIQUE(E1)
Formula2: UNIQUE(E2:E13)
Level: easy
Question: Show the years, book titles, and publishers, in descending order by year
Formula: SORT(UNIQUE(HSTACK(B1,D1,E1)), 1, -1)
Formula2: SORT(UNIQUE(HSTACK(B2:B13,D2:D13,E2:E13)), 1, -1)
Level: medium
Question: What are the years, titles, and publishers for all books, ordered by year descending?
Formula: SORTBY(CHOOSE({1,2,3},B1,D1,E1),B1,-1)
Formula2: SORTBY(CHOOSE({1,2,3},B2:B13,D2:D13,E2:E13),B2:B13,-1)
Level: easy
Question: Show all publishers and the number of books for each publisher.
Formula: SUMMARIZE(E1,DCOUNTX(D1))
Formula2: SUMMARIZE(E2:E13,DCOUNTX(D2:D13))
Level: easy
Question: How many books are there for each publisher?
Formula: SUMMARIZE(E1,DCOUNTX(D1))
Formula2: SUMMARIZE(E2:E13,DCOUNTX(D2:D13))
Level: easy
Question: What is the publisher with most number of books?
Formula: TAKE(SORT(SUMMARIZE(E1,DCOUNTX(D1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(E2:E13,DCOUNTX(D2:D13)), 2, -1), 1)
Level: hard
Question: Return the publisher that has the most books.
Formula: TAKE(SORT(SUMMARIZE(E1,DCOUNTX(D1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(E2:E13,DCOUNTX(D2:D13)), 2, -1), 1)
Level: hard
Question: How many books fall into each category?
Formula: SUMMARIZE(F1,DCOUNTX(D1))
Formula2: SUMMARIZE(F2:F13,DCOUNTX(D2:D13))
Level: easy
Question: List categories that have at least two books after year 1989.
Formula: LET(query1,LET(query1,FILTER(A1:G1,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,LET(query1,FILTER(A2:G13,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: What categories have two or more corresponding books that were made after 1989?
Formula: LET(query1,LET(query1,FILTER(A1:G1,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,LET(query1,FILTER(A2:G13,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: total number of book clubs
Formula: SUM(A1)
Formula2: SUM(A2:A13)
Level: easy
Question: How many book clubs are there?
Formula: SUM(A1)
Formula2: SUM(A2:A13)
Level: easy
Question: Titles, authors or editors of books published in 1989.
Formula: LET(query1,FILTER(A1:G1,Year(B1)=1989),UNIQUE(CHOOSECOLS(query1,4,3)))
Formula2: LET(query1,FILTER(A2:G13,Year(B1)=1989),UNIQUE(CHOOSECOLS(query1,4,3)))
Level: hard
Question: Titles, authors or editors for post-1989 published books.
Formula: LET(query1,FILTER(A1:G1,Year(B1)>1989),UNIQUE(CHOOSECOLS(query1,4,3)))
Formula2: LET(query1,FILTER(A2:G13,Year(B1)>1989),UNIQUE(CHOOSECOLS(query1,4,3)))
Level: hard
Question: Book titles and publishers 
Formula: UNIQUE(HSTACK(E1,D1))
Formula2: UNIQUE(HSTACK(E2:E13,D2:D13))
Level: easy
Question: book titles and publishers.
Formula: UNIQUE(HSTACK(D1,E1))
Formula2: UNIQUE(HSTACK(D2:D13,E2:E13))
Level: easy
Question: Titles and publishers for books from earliest published one to latest one.
Formula: SORT(UNIQUE(HSTACK(D1,E1,B1)), 3, 1)
Formula2: SORT(UNIQUE(HSTACK(D2:D13,E2:E13,B2:B13)), 3, 1)
Level: medium
Question: book titles and publishers in descending order of year published
Formula: SORT(UNIQUE(HSTACK(B1,D1,E1)), 1, -1)
Formula2: SORT(UNIQUE(HSTACK(B2:B13,D2:D13,E2:E13)), 1, -1)
Level: medium
Question: How many book has each publisher published?
Formula: SUMMARIZE(E1,DCOUNTX(D1))
Formula2: SUMMARIZE(E2:E13,DCOUNTX(D2:D13))
Level: easy
Question: How many books did each publisher publish? 
Formula: SUMMARIZE(E1,DCOUNTX(D1))
Formula2: SUMMARIZE(E2:E13,DCOUNTX(D2:D13))
Level: easy
Question: Publisher with the most books published.
Formula: TAKE(SORT(SUMMARIZE(E1,DCOUNTX(D1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(E2:E13,DCOUNTX(D2:D13)), 2, -1), 1)
Level: hard
Question: Publishers which have published most books.
Formula: TAKE(SORT(SUMMARIZE(E1,DCOUNTX(D1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(E2:E13,DCOUNTX(D2:D13)), 2, -1), 1)
Level: hard
Question: How many books does each category have?
Formula: SUMMARIZE(F1,DCOUNTX(D1))
Formula2: SUMMARIZE(F2:F13,DCOUNTX(D2:D13))
Level: easy
Question: Categories with at least 2 books publsihed after 1989.
Formula: LET(query1,LET(query1,FILTER(A1:G1,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,LET(query1,FILTER(A2:G13,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: the number of book clubs
Formula: SUM(A1)
Formula2: SUM(A2:A13)
Level: easy
Question: How many book clubs?
Formula: SUM(A1)
Formula2: SUM(A2:A13)
Level: easy
Question: Titles, authors or editors for books published after 1989.
Formula: LET(query1,FILTER(A1:G1,Year(B1)>1989),UNIQUE(CHOOSECOLS(query1,4,3)))
Formula2: LET(query1,FILTER(A2:G13,Year(B1)>1989),UNIQUE(CHOOSECOLS(query1,4,3)))
Level: hard
Question: What are the book titles and publishers?
Formula: UNIQUE(HSTACK(D1,E1))
Formula2: UNIQUE(HSTACK(D2:D13,E2:E13))
Level: easy
Question: Titles and publishers from the earliest published book to latest one.
Formula: SORT(UNIQUE(HSTACK(B1,D1,E1)), 1, 1)
Formula2: SORT(UNIQUE(HSTACK(B2:B13,D2:D13,E2:E13)), 1, 1)
Level: medium
Question: Titles and publishers from the latest published book to the earliest one. 
Formula: SORT(UNIQUE(HSTACK(D1,E1,B1)), 3, -1)
Formula2: SORT(UNIQUE(HSTACK(D2:D13,E2:E13,B2:B13)), 3, -1)
Level: medium
Question: Number of books published by each publisher.
Formula: SUMMARIZE(E1,DCOUNTX(D1))
Formula2: SUMMARIZE(E2:E13,DCOUNTX(D2:D13))
Level: easy
Question: How many books were published by each publisher?
Formula: SUMMARIZE(E1,DCOUNTX(D1))
Formula2: SUMMARIZE(E2:E13,DCOUNTX(D2:D13))
Level: easy
Question: Which publisher has published most book?
Formula: TAKE(SORT(SUMMARIZE(E1,DCOUNTX(D1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(E2:E13,DCOUNTX(D2:D13)), 2, -1), 1)
Level: hard
Question: Categories which have at least 2 books published after 1989.
Formula: LET(query1,LET(query1,FILTER(A1:G1,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,LET(query1,FILTER(A2:G13,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: Categories with 2 books published or over after 1989.
Formula: LET(query1,LET(query1,FILTER(A1:G1,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,LET(query1,FILTER(A2:G13,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: Categories with at least 2 books published after 1989.
Formula: LET(query1,LET(query1,FILTER(A1:G1,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,LET(query1,FILTER(A2:G13,Year(B1)>1989),SUMMARIZE(CHOOSECOLS(query1,6),DCOUNTX(CHOOSECOLS(query1,4)))),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard