Table:
0
A
B
C
D
E
1
Title
Author
ISBN UK
ISBN US
TV companions featured
2
Search for the Doctor
Dave Martin
ISBN 0-7278-2087-7
ISBN 0-345-33224-5
K-9
3
Crisis in Space
Michael Holt
ISBN 0-7278-2093-1
ISBN 0-345-33225-3
Peri Brown , Vislor Turlough
4
The Garden of Evil
Dave Martin
ISBN 0-7278-2113-X
n/a
None
5
Mission to Venus
William Emms
ISBN 0-7278-2122-9
unknown
Peri Brown
6
Invasion of the Ormazoids
Philip Martin
ISBN 0-7278-2100-8
ISBN 0-345-33231-8
None
7
Race Against Time
Pip and Jane Baker
ISBN 0-7278-2116-4
ISBN 0-345-33228-8
Peri Brown

Questions and formulas:
Question: What is ISBN UK, when Author is "Dave Martin", and when ISBN US is "N/A"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(B1="dave martin")*(D1="n/a")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(B2:B7="dave martin")*(D2:D7="n/a")),3))
Level: medium
Question: What is ISBN US, when Title is "Crisis In Space"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="crisis in space"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,A2:A7="crisis in space"),4))
Level: medium
Question: What is Author, when TV Companions Featured is "Peri Brown", and when Title is "Race Against Time"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="peri brown")*(A1="race against time")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,(E2:E7="peri brown")*(A2:A7="race against time")),2))
Level: medium
Question: What is Title, when TV Companions Featured is "K-9"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="k-9"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,E2:E7="k-9"),1))
Level: medium
Question: What is ISBN US, when Title is "Mission To Venus"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="mission to venus"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,A2:A7="mission to venus"),4))
Level: medium
Question: What is TV Companions Featured, when Author is "William Emms"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="william emms"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,B2:B7="william emms"),5))
Level: medium