Table:
0
A
B
C
D
E
F
1
conductor id
name
age
nationality
year of work
conductor
2
1
Antal Doráti
40
USA
10
3
2
Igor Stravinsky
41
UK
11
4
3
Colin Davis
42
USA
6
5
4
Paul Jorgensen
43
UK
11
6
5
Antal Brown
43
USA
20
7
6
Charles Dutoit
43
France
12
8
7
Gerard Schwarz
50
USA
20
9
8
Pierre Boulez
49
UK
11
10
9
Valeri Gergiev
47
USA
16
11
10
Robert Craft
63
UK
21
12
11
Seiji Ozawa
43
USA
10
13
12
Michael Tilson Thomas
42
France
12

Questions and formulas:
Question: How many conductors are there?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F13))
Level: easy
Question: Count the number of conductors.
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F13))
Level: easy
Question: List the names of conductors in ascending order of age.
Formula: SORTBY(B1,C1,1)
Formula2: SORTBY(B2:B13,C2:C13,1)
Level: easy
Question: What are the names of conductors, ordered by age?
Formula: SORTBY(B1,C1,1)
Formula2: SORTBY(B2:B13,C2:C13,1)
Level: easy
Question: What are the names of conductors whose nationalities are not "USA"?
Formula: FILTER(B1,D1<>"USA")
Formula2: FILTER(B2:B13,D2:D13<>"USA")
Level: easy
Question: Return the names of conductors that do not have the nationality "USA".
Formula: FILTER(B1,D1<>"USA")
Formula2: FILTER(B2:B13,D2:D13<>"USA")
Level: easy
Question: How many different nationalities do conductors have?
Formula: ROWS(UNIQUE(D1))
Formula2: ROWS(UNIQUE(D2:D13))
Level: easy
Question: Count the number of different nationalities of conductors.
Formula: ROWS(UNIQUE(D1))
Formula2: ROWS(UNIQUE(D2:D13))
Level: easy
Question: List names of conductors in descending order of years of work.
Formula: SORTBY(B1,E1,-1)
Formula2: SORTBY(B2:B13,E2:E13,-1)
Level: easy
Question: List the name of the conductor with the most years of work.
Formula: LET(a,SORTBY(B1,E1,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Formula2: LET(a,SORTBY(B2:B13,E2:E13,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Level: hard
Question: total of nationalities and conductors respectively 
Formula: HSTACK(ROWS(UNIQUE(D1)), ROWS(UNIQUE(F1)))
Formula2: HSTACK(ROWS(UNIQUE(D2:D13)), ROWS(UNIQUE(F2:F13)))
Level: hard
Question: number of nationalities and conductors respectively 
Formula: HSTACK(ROWS(UNIQUE(D1)), ROWS(UNIQUE(F1)))
Formula2: HSTACK(ROWS(UNIQUE(D2:D13)), ROWS(UNIQUE(F2:F13)))
Level: hard
Question: Name of conductor with the longest work experience 
Formula: LET(a,HSTACK(B1,F1),b,F1,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(F1,SUMX(E1)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(B2:B13,F2:F13),b,F2:F13,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(F2:F13,SUMX(E2:E13)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: the count of conductors
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F13))
Level: easy
Question: How many conductors are there?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F13))
Level: easy
Question: Names of conductors apart from those from the USA
Formula: LET(query1,FILTER(A1:F1,D1<>"usa"),UNIQUE(CHOOSECOLS(query1,2,6)))
Formula2: LET(query1,FILTER(A2:F13,D2:D13<>"usa"),UNIQUE(CHOOSECOLS(query1,2,6)))
Level: hard
Question: the names of conductors whose nationalities are not usa
Formula: LET(a,HSTACK(B1,F1),b,F1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1<>"usa"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(B2:B13,F2:F13),b,F2:F13,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:F13,D2:D13<>"usa"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: How many conductors?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F13))
Level: easy
Question: names of conductors who are not from usa
Formula: LET(a,HSTACK(B1,F1),b,F1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1<>"usa"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(B2:B13,F2:F13),b,F2:F13,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:F13,D2:D13<>"usa"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: the respective number of nationalities and conductors
Formula: HSTACK(ROWS(UNIQUE(D1)), ROWS(UNIQUE(F1)))
Formula2: HSTACK(ROWS(UNIQUE(D2:D13)), ROWS(UNIQUE(F2:F13)))
Level: hard
Question: The respective number of conductors and nationalities in total.
Formula: HSTACK(ROWS(UNIQUE(D1)), ROWS(UNIQUE(F1)))
Formula2: HSTACK(ROWS(UNIQUE(D2:D13)), ROWS(UNIQUE(F2:F13)))
Level: hard
Question: The conductor who has been working longest in years and his name.
Formula: TAKE(SORT(SUMMARIZE(HSTACK(B1,F1),SUMX(E1)), 3, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(HSTACK(B2:B13,F2:F13),SUMX(E2:E13)), 3, -1), 1)
Level: hard