Table:
0
A
B
C
D
E
F
G
1
device id
device
carrier
package version
applications
software platform
frequency
2
1
BlackBerry Storm 9530
MTS Mobility
5.0.0.808
5.0.0.419
Android
3
2
Apple
Verizon Wireless
5.0.0.328
5.0.0.328
iOS
4
3
Huawei
Telus Mobility
5.0.0.419
5.0.0.419
Android
5
4
Xiaomi
Bell Mobility
5.0.0.419
5.0.0.419
Android
6
5
Samsung
Iusacell
4.7.0.208
4.7.0.151
Android
7
6
Galaxy
Vodafone AU
5.0.0.742
5.0.0.451
Android

Questions and formulas:
Question: How many devices are there?
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B7))
Level: easy
Question: Count the number of devices.
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B7))
Level: easy
Question: What are the carriers of devices whose software platforms are not "Android"?
Formula: FILTER(C1,F1<>"Android")
Formula2: FILTER(C2:C7,F2:F7<>"Android")
Level: easy
Question: Return the device and carriers that do not have Android as their software platform.
Formula: LET(query1,FILTER(A1:G1,F1<>"android"),UNIQUE(CHOOSECOLS(query1,2,3)))
Formula2: LET(query1,FILTER(A2:G7,F2:F7<>"android"),UNIQUE(CHOOSECOLS(query1,2,3)))
Level: hard
Question: How many different software platforms are there for devices?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F7))
Level: easy
Question: Count the number of different software platforms.
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F7))
Level: easy
Question: Please show different software platforms and the corresponding number of devices using each.
Formula: SUMMARIZE(F1,DCOUNTX(B1))
Formula2: SUMMARIZE(F2:F7,DCOUNTX(B2:B7))
Level: easy
Question: What are the different software platforms for devices, and how many devices have each?
Formula: SUMMARIZE(F1,DCOUNTX(B1))
Formula2: SUMMARIZE(F2:F7,DCOUNTX(B2:B7))
Level: easy
Question: What are the different software platforms for devices, ordered by frequency descending?
Formula: SORT(UNIQUE(HSTACK(F1,B1,G1)), 3, -1)
Formula2: SORT(UNIQUE(HSTACK(F2:F7,B2:B7,G2:G7)), 3, -1)
Level: medium
Question: List the software platform shared by the greatest number of devices.
Formula: TAKE(SORT(SUMMARIZE(F1,DCOUNTX(B1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(F2:F7,DCOUNTX(B2:B7)), 2, -1), 1)
Level: hard
Question: What is the software platform that is most common?
Formula: TAKE(SORT(SUMMARIZE(F1,COUNTX(F1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(F2:F7,COUNTX(F2:F7)), 2, -1), 1)
Level: hard
Question: Number of devices for each software platform.
Formula: SUMMARIZE(F1,DCOUNTX(B1))
Formula2: SUMMARIZE(F2:F7,DCOUNTX(B2:B7))
Level: easy
Question: How many devices are there for each software platform?
Formula: SUMMARIZE(F1,DCOUNTX(B1))
Formula2: SUMMARIZE(F2:F7,DCOUNTX(B2:B7))
Level: easy
Question: devices and software platforms by frequency from high to low.
Formula: SORT(UNIQUE(HSTACK(F1,B1,G1)), 3, -1)
Formula2: SORT(UNIQUE(HSTACK(F2:F7,B2:B7,G2:G7)), 3, -1)
Level: medium
Question: software platform with most devices
Formula: TAKE(SORT(SUMMARIZE(F1,DCOUNTX(B1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(F2:F7,DCOUNTX(B2:B7)), 2, -1), 1)
Level: hard
Question: the most popular software platform
Formula: TAKE(SORT(SUMMARIZE(F1,COUNTX(F1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(F2:F7,COUNTX(F2:F7)), 2, -1), 1)
Level: hard
Question: the number of devices
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B7))
Level: easy
Question: How many devices?
Formula: ROWS(UNIQUE(B1))
Formula2: ROWS(UNIQUE(B2:B7))
Level: easy
Question: Carriers in alphabetical order of devices.
Formula: SORT(UNIQUE(HSTACK(C1,B1)), 2, 1)
Formula2: SORT(UNIQUE(HSTACK(C2:C7,B2:B7)), 2, 1)
Level: medium
Question: carriers and devices that don't use android 
Formula: LET(query1,FILTER(A1:G1,F1<>"android"),UNIQUE(CHOOSECOLS(query1,3,2)))
Formula2: LET(query1,FILTER(A2:G7,F2:F7<>"android"),UNIQUE(CHOOSECOLS(query1,3,2)))
Level: hard
Question: Which devices and carriers don't use android software?
Formula: LET(query1,FILTER(A1:G1,F1<>"android"),UNIQUE(CHOOSECOLS(query1,2,3)))
Formula2: LET(query1,FILTER(A2:G7,F2:F7<>"android"),UNIQUE(CHOOSECOLS(query1,2,3)))
Level: hard
Question: Number of software platforms and devices.
Formula: HSTACK(ROWS(UNIQUE(F1)), ROWS(UNIQUE(B1)))
Formula2: HSTACK(ROWS(UNIQUE(F2:F7)), ROWS(UNIQUE(B2:B7)))
Level: hard
Question: How many software platforms are there?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F7))
Level: easy
Question: the carrier and device whose software platform is not android.
Formula: LET(query1,FILTER(A1:G1,F1<>"android"),UNIQUE(CHOOSECOLS(query1,3,2)))
Formula2: LET(query1,FILTER(A2:G7,F2:F7<>"android"),UNIQUE(CHOOSECOLS(query1,3,2)))
Level: hard
Question: What is the device and carrier whose software is not played on android?
Formula: LET(query1,FILTER(A1:G1,F1<>"android"),UNIQUE(CHOOSECOLS(query1,2,3)))
Formula2: LET(query1,FILTER(A2:G7,F2:F7<>"android"),UNIQUE(CHOOSECOLS(query1,2,3)))
Level: hard
Question: the number of software platforms and devices.
Formula: HSTACK(ROWS(UNIQUE(F1)), ROWS(UNIQUE(B1)))
Formula2: HSTACK(ROWS(UNIQUE(F2:F7)), ROWS(UNIQUE(B2:B7)))
Level: hard
Question: How many software platforms?
Formula: ROWS(UNIQUE(F1))
Formula2: ROWS(UNIQUE(F2:F7))
Level: easy
Question: the number of devices for each software platform.
Formula: SUMMARIZE(F1,DCOUNTX(B1))
Formula2: SUMMARIZE(F2:F7,DCOUNTX(B2:B7))
Level: easy
Question: How many devices does each software platform have?
Formula: SUMMARIZE(F1,DCOUNTX(B1))
Formula2: SUMMARIZE(F2:F7,DCOUNTX(B2:B7))
Level: easy
Question: the device, frequency and software platform by frequency from high to low.
Formula: SORT(UNIQUE(HSTACK(F1,B1,G1)), 3, -1)
Formula2: SORT(UNIQUE(HSTACK(F2:F7,B2:B7,G2:G7)), 3, -1)
Level: medium
Question: The software platform adapted by most devices.
Formula: TAKE(SORT(SUMMARIZE(F1,DCOUNTX(B1)), 2, -1), 1)
Formula2: TAKE(SORT(SUMMARIZE(F2:F7,DCOUNTX(B2:B7)), 2, -1), 1)
Level: hard