Table:
0
A
B
C
D
E
F
1
document id
date stored
document type code
document name
document description
other details
2
7
6/15/1976 3:40
CV
Robin CV
3
11
10/14/1986 17:53
CV
Marry CV
4
25
6/8/2008 12:45
BK
One hundred years of solitude
5
39
7/3/2012 9:48
BK
How to read a book
6
72
7/3/2012 9:48
CV
Alan CV
7
81
1/1/1995 3:52
BK
Hua Mulan
8
99
6/8/2008 12:45
CV
Leon CV
9
111
11/5/1987 6:11
PR
Learning features of CNN
10
119
6/8/2008 12:45
RV
Marriage and population
11
120
3/10/1997 15:24
RV
Society and tax
12
166
3/10/1997 15:24
PR
Are you talking to a machine
13
170
8/18/2009 3:29
RV
Population
14
230
6/15/1976 3:40
CV
Martin CV
15
252
6/15/1976 3:40
BK
Summer
16
260
3/10/1997 15:24
BK
Cats and me

Questions and formulas:
Question: How many documents do cv and bk have?
Formula: SUM(FILTER(A1, (C1="cv")+(C1="bk")))
Formula2: SUM(FILTER(A2:A16, (C2:C16="cv")+(C2:C16="bk")))
Level: easy
Question: The number of documents for cv and bk.
Formula: SUM(FILTER(A1, (C1="cv")+(C1="bk")))
Formula2: SUM(FILTER(A2:A16, (C2:C16="cv")+(C2:C16="bk")))
Level: easy
Question: Marry cv storage date and corresponding document id
Formula: LET(query1,FILTER(A1:F1,D1="marry cv"),UNIQUE(CHOOSECOLS(query1,2,1)))
Formula2: LET(query1,FILTER(A2:F16,D2:D16="marry cv"),UNIQUE(CHOOSECOLS(query1,2,1)))
Level: hard
Question: When was marry cv stored?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1="marry cv"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F16,D2:D16="marry cv"),2))
Level: medium
Question: How many documents does cv or bk have?
Formula: SUM(FILTER(A1, (C1="cv")+(C1="bk")))
Formula2: SUM(FILTER(A2:A16, (C2:C16="cv")+(C2:C16="bk")))
Level: easy
Question: When was marry cv stored and its document id?
Formula: LET(query1,FILTER(A1:F1,D1="marry cv"),UNIQUE(CHOOSECOLS(query1,2,1)))
Formula2: LET(query1,FILTER(A2:F16,D2:D16="marry cv"),UNIQUE(CHOOSECOLS(query1,2,1)))
Level: hard