Table:
0
A
B
C
D
E
1
Source
Date
DeSUS
Zares
NLPD
2
Mediana
May 11–13
11.7% (1)
8.6%
2.2%
3
Delo
May 12–14
5.5%
11% (1)
N/A
4
Delo
May 21–22
9% (1)
11% (1)
N/A
5
Zurnal
May 28
6%
12% (1)
N/A
6
Delo
May 27–28
7%
13% (1)
N/A
7
Mediana
May 25–27
11.1% (1)
8%
1.2%

Questions and formulas:
Question: What is the percentage for Zares on May 21–22?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="may 21–22"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,B2:B7="may 21–22"),4))
Level: medium
Question: What is the source for 7% DeSUS?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="7%"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,C2:C7="7%"),1))
Level: medium
Question: What is the source for Zares at 8.6%?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="8.6%"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,D2:D7="8.6%"),1))
Level: medium
Question: What is the source corresponding to a date of May 25–27?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="may 25–27"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E7,B2:B7="may 25–27"),1))
Level: medium