Table:
0
A
B
C
D
E
1
train id
name
time
service
train
2
1
Ananthapuri Express
17:15
Daily
3
2
Guruvayur Express
22:10
Daily
4
3
Guruvayur Express
4:49
Daily
5
4
Ananthapuri Express
11:35
Daily
6
5
Jayanthi Janatha Express
06:30
Daily
7
6
Island Express
11:15
Daily
8
7
Madurai Fast Passenger
21:49
Daily
9
8
Quilon Fast Passenger
04:55
Daily
10
9
Island Express
16:59
Daily
11
10
Jayanthi Janatha Express
10:38
Daily
12
11
Parasuram Express
04:20
Daily

Questions and formulas:
Question: Show the name, time, and service for all trains.
Formula: CHOOSE({1,2,3},B1,C1,D1)
Formula2: CHOOSE({1,2,3},B2:B12,C2:C12,D2:D12)
Level: easy
Question: Show the number of trains
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E12))
Level: easy
Question: Show the name and service in order by time
Formula: SORT(UNIQUE(HSTACK(B1,D1,C1)), 3, 1)
Formula2: SORT(UNIQUE(HSTACK(B2:B12,D2:D12,C2:C12)), 3, 1)
Level: medium
Question: names, services, times and trains
Formula: UNIQUE(HSTACK(B1,C1,D1,E1))
Formula2: UNIQUE(HSTACK(B2:B12,C2:C12,D2:D12,E2:E12))
Level: easy
Question: How many trains in total?
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E12))
Level: easy
Question: Service and names in chronological order by time.
Formula: SORT(UNIQUE(HSTACK(D1,C1,B1)), 2, 1)
Formula2: SORT(UNIQUE(HSTACK(D2:D12,C2:C12,B2:B12)), 2, 1)
Level: medium
Question: the name, service, time and train
Formula: UNIQUE(HSTACK(B1,C1,D1,E1))
Formula2: UNIQUE(HSTACK(B2:B12,C2:C12,D2:D12,E2:E12))
Level: easy
Question: How many trains?
Formula: ROWS(UNIQUE(E1))
Formula2: ROWS(UNIQUE(E2:E12))
Level: easy