Table:
0
A
B
C
D
E
1
Release format
Country
Label
Cat. No.
Release date
2
Vinyl
West Germany
Ariola
203 265-320
1980
3
Cassette
West Germany
Ariola
401 265-352
1980
4
Vinyl
West Germany
Ariola
302 208
1980
5
Vinyl
Spain
Ariola
1-201265
1980
6
Vinyl
Canada
Quality
Sv 2070
1980
7
Vinyl
Yugoslavia
RTB
St 2220164
1980
8
Vinyl
Italy
Rca Victor
PL 31503
1980
9
Cassette
Italy
Rca Victor
PK 31503
1980
10
Vinyl
Portugal
Ariola
72 877
1980
11
Vinyl
United Kingdom
Ariola
ARL 5051
1980
12
Vinyl
Worldwide
Ariola
201 265-352
1980

Questions and formulas:
Question: How many release dates has Canada had?
Formula: ROWS(UNIQUE(FILTER(E1, B1="canada")))
Formula2: ROWS(UNIQUE(FILTER(E2:E12, B2:B12="canada")))
Level: medium