Table:
0
A
B
C
D
E
F
1
customer id
address id
customer name
customer phone
customer email address
other details
2
240
286
Harold
624-096-7791
jerde.harmon@example.com
3
267
98
Federico
914-915-7483
johnson27@example.com
4
304
369
Samson
1-463-121-4086x655
dalton75@example.com
5
418
369
Daryl
(191)727-6065x6351
hickle.jazmyn@example.org
6
516
110
Robert
903.657.6967x467
fheathcote@example.com
VIP
7
518
180
Jacques
2902266118
eleannon@example.org
8
546
266
Davonte
(941)313-1839x94608
keanu70@example.net
VIP
9
556
19
Blake
056.568.7725
clemens43@example.org
10
633
148
Elwyn
388.863.3459x0915
ggrant@example.com
11
712
266
Alek
398.352.1753
terry.nels@example.com
12
714
230
Adelbert
(514)659-1318x46123
hermann.veum@example.org
13
793
74
Isaiah
347.178.3326
dudley08@example.net
14
823
383
Ephraim
3189033909
gage.johns@example.org
15
957
207
Cedrick
620-987-5897
nschmidt@example.org
16
998
201
Wade
+46(5)7576252034
cassin.cielo@example.org

Questions and formulas:
Question: How many customers?
Formula: SUM(A1)
Formula2: SUM(A2:A16)
Level: easy
Question: Total amount of customers received.
Formula: SUM(A1)
Formula2: SUM(A2:A16)
Level: easy
Question: Harold's phone and email address
Formula: LET(query1,FILTER(A1:F1,C1="harold"),UNIQUE(CHOOSECOLS(query1,4,5)))
Formula2: LET(query1,FILTER(A2:F16,C2:C16="harold"),UNIQUE(CHOOSECOLS(query1,4,5)))
Level: hard
Question: How many customers received?
Formula: SUM(A1)
Formula2: SUM(A2:A16)
Level: easy
Question: the phone and email address of harold.
Formula: LET(query1,FILTER(A1:F1,C1="harold"),UNIQUE(CHOOSECOLS(query1,4,5)))
Formula2: LET(query1,FILTER(A2:F16,C2:C16="harold"),UNIQUE(CHOOSECOLS(query1,4,5)))
Level: hard