Table:
0
A
B
C
D
E
1
singer id
name
birth year
net worth millions
citizenship
2
1
Liliane Bettencourt
1/1/1944
30
France
3
2
Christy Walton
1/1/1948
28.8
United States
4
3
Alice Walton
1/1/1949
26.3
United States
5
4
Iris Fontbona
1/1/1942
17.4
Chile
6
5
Jacqueline Mars
1/1/1940
17.8
United States
7
6
Gina Rinehart
1/1/1953
17
Australia
8
7
Susanne Klatten
1/1/1962
14.3
Germany
9
8
Abigail Johnson
1/1/1961
12.7
United States

Questions and formulas:
Question: How many singers are there?
Formula: SUM(A1)
Formula2: SUM(A2:A9)
Level: easy
Question: What is the count of singers?
Formula: SUM(A1)
Formula2: SUM(A2:A9)
Level: easy
Question: What are the names of singers ordered by ascending net worth?
Formula: SORTBY(B1,D1,1)
Formula2: SORTBY(B2:B9,D2:D9,1)
Level: easy
Question: What are the birth year and citizenship of singers?
Formula: CHOOSE({1,2},C1,E1)
Formula2: CHOOSE({1,2},C2:C9,E2:E9)
Level: easy
Question: What are the birth years and citizenships of the singers?
Formula: CHOOSE({1,2},C1,E1)
Formula2: CHOOSE({1,2},C2:C9,E2:E9)
Level: easy
Question: List the name of singers whose citizenship is not "France".
Formula: FILTER(B1,E1<>"France")
Formula2: FILTER(B2:B9,E2:E9<>"France")
Level: easy
Question: What are the names of the singers who are not French citizens?
Formula: FILTER(B1,E1<>"France")
Formula2: FILTER(B2:B9,E2:E9<>"France")
Level: easy
Question: Show the name of singers whose birth year is either 1948 or 1949?
Formula: FILTER(B1,(C1=1948)+(C1=1949))
Formula2: FILTER(B2:B9,(C2:C9=1948)+(C2:C9=1949))
Level: easy
Question: What are the names of the singers whose birth years are either 1948 or 1949?
Formula: FILTER(B1,(C1=1948)+(C1=1949))
Formula2: FILTER(B2:B9,(C2:C9=1948)+(C2:C9=1949))
Level: easy
Question: What is the name of the singer with the largest net worth?
Formula: LET(a,SORTBY(B1,D1,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Formula2: LET(a,SORTBY(B2:B9,D2:D9,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Level: hard
Question: Show different citizenship of singers and the number of singers of each citizenship.
Formula: SUMMARIZE(E1,SUMX(A1))
Formula2: SUMMARIZE(E2:E9,SUMX(A2:A9))
Level: easy
Question: For each citizenship, how many singers are from that country?
Formula: SUMMARIZE(E1,SUMX(A1))
Formula2: SUMMARIZE(E2:E9,SUMX(A2:A9))
Level: easy
Question: For each citizenship, what is the maximum net worth?
Formula: SUMMARIZE(E1,MAXX(D1))
Formula2: SUMMARIZE(E2:E9,MAXX(D2:D9))
Level: easy
Question: What is the highest net worth value for each citizenship?
Formula: SUMMARIZE(E1,MAXX(D1))
Formula2: SUMMARIZE(E2:E9,MAXX(D2:D9))
Level: easy
Question: the number of singers
Formula: SUM(A1)
Formula2: SUM(A2:A9)
Level: easy
Question: What's the total number of singers?
Formula: SUM(A1)
Formula2: SUM(A2:A9)
Level: easy
Question: Singers' birth year and nationality 
Formula: UNIQUE(HSTACK(C1,E1,A1))
Formula2: UNIQUE(HSTACK(C2:C9,E2:E9,A2:A9))
Level: easy
Question: What is the birth year and citizenship for each singer?
Formula: UNIQUE(HSTACK(C1,E1,A1))
Formula2: UNIQUE(HSTACK(C2:C9,E2:E9,A2:A9))
Level: easy
Question: All singer ids and names but French singers
Formula: LET(query1,FILTER(A1:E1,E1<>"france"),UNIQUE(CHOOSECOLS(query1,1,2)))
Formula2: LET(query1,FILTER(A2:E9,E2:E9<>"france"),UNIQUE(CHOOSECOLS(query1,1,2)))
Level: hard
Question: The ids and names for singers who are not French citizens.
Formula: LET(a,HSTACK(A1,B1),b,A1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1<>"france"),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(A2:A9,B2:B9),b,A2:A9,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:A9:E1,E2:E9<>"france"),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: The ids and names for singers who were born in 1948 and 1949.
Formula: LET(a,HSTACK(A1,B1),b,A1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:E1,(Year(C1)=1948)+(Year(C1)=1949)),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(A2:A9,B2:B9),b,A2:A9,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:A9:E1,(Year(C1)=1948)+(Year(C1)=1949)),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: The ids and names of singers born between 1948 and 1949.
Formula: LET(query1,FILTER(A1:E1,(Year(C1)>=1948)*(Year(C1)<1950)),UNIQUE(CHOOSECOLS(query1,1,2)))
Formula2: LET(query1,FILTER(A2:E9,(Year(C1)>=1948)*(Year(C1)<1950)),UNIQUE(CHOOSECOLS(query1,1,2)))
Level: hard
Question: Name and id of the singer having highest net worth millions
Formula: LET(a,HSTACK(B1,A1),b,A1,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(A1,SUMX(D1)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(B2:B9,A2:A9),b,A2:A9,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(A2:A9,SUMX(D2:D9)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: the number of singers from each country 
Formula: SUMMARIZE(E1,SUMX(A1))
Formula2: SUMMARIZE(E2:E9,SUMX(A2:A9))
Level: easy
Question: the number of singers of each citizenship.
Formula: SUMMARIZE(E1,SUMX(A1))
Formula2: SUMMARIZE(E2:E9,SUMX(A2:A9))
Level: easy
Question: What is the highest net worth value under each citizenship?
Formula: SUMMARIZE(E1,MAXX(D1))
Formula2: SUMMARIZE(E2:E9,MAXX(D2:D9))
Level: easy
Question: How many singers?
Formula: SUM(A1)
Formula2: SUM(A2:A9)
Level: easy
Question: The birth year and citizenship for each singer.
Formula: UNIQUE(HSTACK(C1,E1,A1))
Formula2: UNIQUE(HSTACK(C2:C9,E2:E9,A2:A9))
Level: easy
Question: The ids and names for singers who are not French.
Formula: LET(a,HSTACK(A1,B1),b,A1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1<>"france"),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(A2:A9,B2:B9),b,A2:A9,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:A9:E1,E2:E9<>"france"),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: The ids and names of singers whose birth year is 1948 or 1949.
Formula: LET(a,HSTACK(A1,B1),b,A1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:E1,(Year(C1)=1948)+(Year(C1)=1949)),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(A2:A9,B2:B9),b,A2:A9,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:A9:E1,(Year(C1)=1948)+(Year(C1)=1949)),1)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: The name and id of singer with highest net worth millions
Formula: TAKE(SORT(SUMMARIZE(HSTACK(B1,A1),SUMX(D1)), 3, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(HSTACK(B2:B9,A2:A9),SUMX(D2:D9)), 3, -1), 1)
Level: hard
Question: the number of singers for each citizenship
Formula: SUMMARIZE(E1,SUMX(A1))
Formula2: SUMMARIZE(E2:E9,SUMX(A2:A9))
Level: easy