Table:
0
A
B
C
D
E
F
1
performance id
date
host
location
attendance
performance
2
1.0
February 2
Boston Bruins
TD Garden
165
3
2.0
February 4
New York Rangers
Madison Square Garden
1820
4
3.0
February 5
Atlanta Thrashers
Verizon Center
1878
5
4.0
February 7
Pittsburgh Penguins
Verizon Center
1877
6
5.0
February 10
Montreal Canadiens
Bell Centre
2173
7
6.0
February 11
Ottawa Senators
Scotiabank Place
1982

Questions and formulas:
Question: How many total performances?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F7))
Level: easy
Question: dates and locations of all performances
Formula: UNIQUE(HSTACK(B1,D1,F1))
Formula2: UNIQUE(HSTACK(B2:B7,D2:D7,F2:F7))
Level: easy
Question: How many performances took place at each location?
Formula: SUMMARIZE(D1,DCOUNTX(F1))
Formula2: SUMMARIZE(D2:D7,DCOUNTX(F2:F7))
Level: easy
Question: Locations where at least 2 performances were held.
Formula: LET(query1,SUMMARIZE(D1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(D2:D7,DCOUNTX(F2:F7)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: How many performances?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F7))
Level: easy
Question: the dates and locations of performances
Formula: UNIQUE(HSTACK(B1,D1,F1))
Formula2: UNIQUE(HSTACK(B2:B7,D2:D7,F2:F7))
Level: easy
Question: How many performances at each location?
Formula: SUMMARIZE(D1,DCOUNTX(F1))
Formula2: SUMMARIZE(D2:D7,DCOUNTX(F2:F7))
Level: easy
Question: The locations where at least 2 performances were held.
Formula: LET(query1,SUMMARIZE(D1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(D2:D7,DCOUNTX(F2:F7)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard