Table:
0
A
B
C
D
E
F
1
technician id
name
team
starting year
age
technician
2
1
Joe Sewell
NYY
1/1/2012
37
3
2
John Brown
NYY
1/1/2013
36
4
3
Tony Sewell
CLE
1/1/2005
43
5
4
Mark Sewell
CLE
1/1/2009
28
6
5
Charlie Hollocher
CHC
1/1/2002
35
7
6
Lou Boudreau
CLE
1/1/2016
32
8
7
Eddie Collins
CWS
1/1/2005
45
9
8
Joe Cochrane
CLE
1/1/2006
46
10
9
Eddie Collins
CWS
1/1/2003
47
11
10
Mickey Cochrane
PHA
1/1/2009
38

Questions and formulas:
Question: How many technicians are there?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F11))
Level: easy
Question: What is the number of technicians?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F11))
Level: easy
Question: List the names of technicians in ascending order of age.
Formula: SORTBY(B1,E1,1)
Formula2: SORTBY(B2:B11,E2:E11,1)
Level: easy
Question: What are the names of the technicians by ascending order of age?
Formula: SORTBY(B1,E1,1)
Formula2: SORTBY(B2:B11,E2:E11,1)
Level: easy
Question: What are the team and starting year of technicians?
Formula: CHOOSE({1,2},C1,D1)
Formula2: CHOOSE({1,2},C2:C11,D2:D11)
Level: easy
Question: What is the team and starting year for each technician?
Formula: CHOOSE({1,2},C1,D1)
Formula2: CHOOSE({1,2},C2:C11,D2:D11)
Level: easy
Question: List the name of technicians whose team is not "NYY".
Formula: FILTER(B1,C1<>"NYY")
Formula2: FILTER(B2:B11,C2:C11<>"NYY")
Level: easy
Question: What is the name of the technician whose team is not 'NYY'?
Formula: FILTER(B1,C1<>"NYY")
Formula2: FILTER(B2:B11,C2:C11<>"NYY")
Level: easy
Question: What is the starting year of the oldest technicians?
Formula: LET(a,SORTBY(D1,E1,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Formula2: LET(a,SORTBY(D2:D11,E2:E11,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Level: hard
Question: What is the starting year for the oldest technician?
Formula: LET(a,SORTBY(D1,E1,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Formula2: LET(a,SORTBY(D2:D11,E2:E11,-1),FILTER(a,SEQUENCE(ROWS(a))<=1))
Level: hard
Question: Show different teams of technicians and the number of technicians in each team.
Formula: SUMMARIZE(C1,DCOUNTX(F1))
Formula2: SUMMARIZE(C2:C11,DCOUNTX(F2:F11))
Level: easy
Question: For each team, how many technicians are there?
Formula: SUMMARIZE(C1,DCOUNTX(F1))
Formula2: SUMMARIZE(C2:C11,DCOUNTX(F2:F11))
Level: easy
Question: Please show the team that has the most number of technicians.
Formula: TAKE(SORT(SUMMARIZE(C1,DCOUNTX(F1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(C2:C11,DCOUNTX(F2:F11)), 2, -1), 1)
Level: hard
Question: What are the teams with the most technicians?
Formula: TAKE(SORT(SUMMARIZE(C1,DCOUNTX(F1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(C2:C11,DCOUNTX(F2:F11)), 2, -1), 1)
Level: hard
Question: Show the team that have at least two technicians.
Formula: LET(query1,SUMMARIZE(C1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(C2:C11,DCOUNTX(F2:F11)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: What is the team with at least 2 technicians?
Formula: LET(query1,SUMMARIZE(C1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(C2:C11,DCOUNTX(F2:F11)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: How many technicians in this spreadsheet? 
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F11))
Level: easy
Question: The number of technicians
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F11))
Level: easy
Question: The team and starting year for each technician
Formula: UNIQUE(HSTACK(C1,D1,F1))
Formula2: UNIQUE(HSTACK(C2:C11,D2:D11,F2:F11))
Level: easy
Question: technician's teams and starting years 
Formula: UNIQUE(HSTACK(C1,D1,F1))
Formula2: UNIQUE(HSTACK(C2:C11,D2:D11,F2:F11))
Level: easy
Question: Names and info of technicians who don't work with NYY
Formula: LET(a,HSTACK(B1,F1),b,F1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1<>"nyy"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(B2:B11,F2:F11),b,F2:F11,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:F11,C2:C11<>"nyy"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: Names and info of all technicians except those who work with NYY
Formula: LET(query1,FILTER(A1:F1,C1<>"nyy"),UNIQUE(CHOOSECOLS(query1,2,6)))
Formula2: LET(query1,FILTER(A2:F11,C2:C11<>"nyy"),UNIQUE(CHOOSECOLS(query1,2,6)))
Level: hard
Question: When did the oldest technician start working?
Formula: LET(a,HSTACK(D1,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(D2:D11,F2:F11),b,F2:F11,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(F2:F11,SUMX(E2:E11)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: The starting year of the oldest technician.
Formula: LET(a,HSTACK(D1,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(D2:D11,F2:F11),b,F2:F11,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(F2:F11,SUMX(E2:E11)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: How many technicians does each team have? 
Formula: SUMMARIZE(C1,DCOUNTX(F1))
Formula2: SUMMARIZE(C2:C11,DCOUNTX(F2:F11))
Level: easy
Question: The number of technicians in each team.
Formula: SUMMARIZE(C1,DCOUNTX(F1))
Formula2: SUMMARIZE(C2:C11,DCOUNTX(F2:F11))
Level: easy
Question: Which team has the most technicians?
Formula: TAKE(SORT(SUMMARIZE(C1,DCOUNTX(F1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(C2:C11,DCOUNTX(F2:F11)), 2, -1), 1)
Level: hard
Question: Team with highest number of technicians 
Formula: TAKE(SORT(SUMMARIZE(C1,DCOUNTX(F1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(C2:C11,DCOUNTX(F2:F11)), 2, -1), 1)
Level: hard
Question: Which teams have two or more technicians? 
Formula: LET(query1,SUMMARIZE(C1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(C2:C11,DCOUNTX(F2:F11)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: Teams with 2 or more technicians 
Formula: LET(query1,SUMMARIZE(C1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(C2:C11,DCOUNTX(F2:F11)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: How many technicians?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F11))
Level: easy
Question: the teams and starting years of technicians
Formula: UNIQUE(HSTACK(C1,D1,F1))
Formula2: UNIQUE(HSTACK(C2:C11,D2:D11,F2:F11))
Level: easy
Question: The names of technicians whose team is not NYY and their technician information.
Formula: LET(a,HSTACK(B1,F1),b,F1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1<>"nyy"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(B2:B11,F2:F11),b,F2:F11,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:F11,C2:C11<>"nyy"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: The names of technicians which are not from team NYY and the corresponding technician information. 
Formula: LET(a,HSTACK(B1,F1),b,F1,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1<>"nyy"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(B2:B11,F2:F11),b,F2:F11,c,CHOOSECOLS(UNIQUE(CHOOSECOLS(FILTER(A2:F11,C2:C11<>"nyy"),6)),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: In which year did the oldest technician start repairing?
Formula: LET(a,HSTACK(D1,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(D2:D11,F2:F11),b,F2:F11,c,CHOOSECOLS(TAKE(SORT(SUMMARIZE(F2:F11,SUMX(E2:E11)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: How many technicians in each team?
Formula: SUMMARIZE(C1,DCOUNTX(F1))
Formula2: SUMMARIZE(C2:C11,DCOUNTX(F2:F11))
Level: easy
Question: The team having the most technicians.
Formula: TAKE(SORT(SUMMARIZE(C1,DCOUNTX(F1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(C2:C11,DCOUNTX(F2:F11)), 2, -1), 1)
Level: hard
Question: Which team has at least 2 technicians?
Formula: LET(query1,SUMMARIZE(C1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(C2:C11,DCOUNTX(F2:F11)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: The team with at least 2 technicians.
Formula: LET(query1,SUMMARIZE(C1,DCOUNTX(F1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(C2:C11,DCOUNTX(F2:F11)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard