Table:
0
A
B
C
D
E
F
1
artist id
artist
age
famous title
famous release date
artist
2
1
Gorgoroth
34
Bergen 1996
November 2007
3
2
Ophiolatry
35
Transmutation
January 21, 2008
4
3
Ophiolatry
22
Antievangelistical Process (re-release)
2009
5
4
Black Flame
18
Imperivm
June 23, 2008
6
5
Tangorodrim
35
Unholy Metal Way (re-release)
2009
7
6
Tangorodrim
27
Those Who Unleashed (re-release)
2009
8
7
Triumfall
49
Antithesis of All Flesh
June 15, 2009

Questions and formulas:
Question: How many artists are there?
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B8))
Level: easy
Question: Count the number of artists.
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B8))
Level: easy
Question: List the age of all music artists.
Formula: C1
Formula2: C2:C8
Level: easy
Question: What are the ages of all music artists?
Formula: C1
Formula2: C2:C8
Level: easy
Question: What is the average age of all artists?
Formula: AVERAGE(C1)
Formula2: AVERAGE(C2:C8)
Level: easy
Question: Return the average age across all artists.
Formula: AVERAGE(C1)
Formula2: AVERAGE(C2:C8)
Level: easy
Question: What are the famous titles of the artist "Triumfall"?
Formula: FILTER(D1,B1="Triumfall")
Formula2: FILTER(D2:D8,B2:B8="Triumfall")
Level: easy
Question: Return the famous titles of the artist called "Triumfall".
Formula: FILTER(D1,B1="Triumfall")
Formula2: FILTER(D2:D8,B2:B8="Triumfall")
Level: easy
Question: What are the distinct Famous release dates?
Formula: UNIQUE(E1)
Formula2: UNIQUE(E2:E8)
Level: easy
Question: Give the distinct famous release dates for all artists.
Formula: UNIQUE(E1)
Formula2: UNIQUE(E2:E8)
Level: easy
Question: Please list the age and famous title of artists in descending order of age.
Formula: SORTBY(CHOOSE({1,2},D1,C1),C1,-1)
Formula2: SORTBY(CHOOSE({1,2},D2:D8,C2:C8),C2:C8,-1)
Level: easy
Question: What are the famous titles and ages of each artist, listed in descending order by age?
Formula: SORTBY(CHOOSE({1,2},D1,C1),C1,-1)
Formula2: SORTBY(CHOOSE({1,2},D2:D8,C2:C8),C2:C8,-1)
Level: easy
Question: What is the famous release date of the artist with the oldest age?
Formula: LET(a,SORTBY(E1,C1,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Formula2: LET(a,SORTBY(E2:E8,C2:C8,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Level: hard
Question: Return the famous release date for the oldest artist.
Formula: LET(a,SORTBY(E1,C1,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Formula2: LET(a,SORTBY(E2:E8,C2:C8,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Level: hard
Question: How many artists?
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B8))
Level: easy
Question: artists' mean age
Formula: SUMMARIZE(B1,AVERAGEX(C1))
Formula2: SUMMARIZE(B2:B8,AVERAGEX(C2:C8))
Level: easy
Question: What’s the average age of all artists? 
Formula: SUMMARIZE(B1,AVERAGEX(C1))
Formula2: SUMMARIZE(B2:B8,AVERAGEX(C2:C8))
Level: easy
Question: the famous titles of triumfall
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="triumfall"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F8,B2:B8="triumfall"),4))
Level: medium
Question: the famous title of triumfall
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="triumfall"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F8,B2:B8="triumfall"),4))
Level: medium
Question: the famous release date
Formula: UNIQUE(E1)
Formula2: UNIQUE(E2:E8)
Level: easy
Question: the famous release date and artist
Formula: UNIQUE(HSTACK(E1,B1))
Formula2: UNIQUE(HSTACK(E2:E8,B2:B8))
Level: easy
Question: oldest artist's release date
Formula: TAKE(SORT(SUMMARIZE(HSTACK(B1,E1),SUMX(C1)), 3, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(HSTACK(B2:B8,E2:E8),SUMX(C2:C8)), 3, -1), 1)
Level: hard
Question: famous release date for the oldest artist
Formula: LET(a,HSTACK(E1,B1),b,B1,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(B1,SUMX(C1)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(E2:E8,B2:B8),b,B2:B8,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(B2:B8,SUMX(C2:C8)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: the mean age for artists
Formula: SUMMARIZE(B1,AVERAGEX(C1))
Formula2: SUMMARIZE(B2:B8,AVERAGEX(C2:C8))
Level: easy
Question: How old are the artists on average?
Formula: SORT(SUMMARIZE(B1,AVERAGEX(C1)), 2, -1)
Formula2: SORT(SUMMARIZE(B2:B8,AVERAGEX(C2:C8)), 2, -1)
Level: medium
Question: the famous release date of the oldest artist
Formula: LET(a,HSTACK(E1,B1),b,B1,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(B1,SUMX(C1)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(E2:E8,B2:B8),b,B2:B8,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(B2:B8,SUMX(C2:C8)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: How many artists are there?
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B8))
Level: easy
Question: How many artists?
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B8))
Level: easy
Question: How many artists released musics?
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B8))
Level: easy