Table:
0
A
B
C
D
E
1
Client
Years of Operation
Area of Operation
Country
Services
2
Agoco
1991-current
Sarir field
Libya
Drilling, workover
3
Lasmo
1993-94
Wadi Borjuj
Libya
Drilling, workover
4
Waha
1994
El Zahra
Libya
Drilling, workover
5
IPC-Dublin
1997-97
Kilwa
Tanzania
Drilling
6
OMV
1997
Field 103
Libya
Drilling, workover
7
Fina
1997
El Hamada
Libya
Drilling, workover
8
Marathon
1998
Manzala field
Egypt
Drilling
9
Khalda/ Repsol
1998-99
West Desert
Egypt
Drilling
10
Total
1999-current
El Mabrouk
Libya
Drilling
11
Agiba-Agip
1999
West Desert
Egypt
Drilling
12
IPLL
1999-current
El Naka field
Libya
Drilling
13
SOC
2000-current
SOC fields
Libya
Drilling
14
Veba
2000
Different fields
Libya
Drilling, workover
15
Perenco Oil Co.
2000-01
EchiraX Concession
Gabon
Drilling

Questions and formulas:
Question: Whose address of operation was the Echirax Concession? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="EchiraX Concession"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E15,C2:C15="EchiraX Concession"),1))
Level: medium
Question: When was the operation in Field 103 executed? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="Field 103"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E15,C2:C15="Field 103"),2))
Level: medium
Question: In what country is the El Hamada area of operation? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="El Hamada"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E15,C2:C15="El Hamada"),4))
Level: medium