Table:
0
A
B
C
D
E
1
Name
Born-Died
Took Office
Left Office
Country
2
Sérgio Vieira de Mello
1948–2003
June 1999
July 1999
Brazil
3
Bernard Kouchner
1939–
15 July 1999
12 January 2001
France
4
Hans Hækkerup
1945–
13 January 2001
31 December 2001
Denmark
5
Michael Steiner
1949–
14 February 2002
8 July 2003
Germany
6
Harri Holkeri
1937–2011
25 August 2003
11 June 2004
Finland
7
Søren Jessen-Petersen
1945–
16 August 2004
30 June 2006
Denmark
8
Joachim Rücker
1951–
1 September 2006
20 June 2008
Germany
9
Lamberto Zannier
1954–
20 June 2008
June 2011
Italy
10
Farid Zarif
1951–
11 October 2011
Incumbent
Afghanistan

Questions and formulas:
Question: Who left office in June 2011?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="june 2011"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,D2:D10="june 2011"),1))
Level: medium
Question: What is the Born-Died date for the Representative of Italy?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="italy"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,E2:E10="italy"),2))
Level: medium
Question: What is the country of the Representative that left office as incumbent?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="incumbent"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,D2:D10="incumbent"),5))
Level: medium