Table:
0
A
B
C
D
E
F
1
Nat.
Name
Status
Contract length
Expiry date
Source
2
ANG
Rui Marques
Signed
2 years
May 2010
Leeds United
3
ENG
Howson
Signed
3 years 1
June 2011
Leeds United
4
ENG
Edwards
Signed
1 year
July 2009
Leeds United
5
ENG
Ovington
Signed
1 year
July 2009
Leeds United
6
ENG
Prutton
Signed
1 year
June 2010
Leeds United
7
SCO
Martin
Signed
3 years
August 2011
Leeds United
8
ENG
Webb
Signed
1 year
August 2009
LUTV
9
ENG
Delph
Signed
4 years
August 2012
Leeds United
10
ENG
White
Signed
4 years
December 2012
Leeds United
11
ENG
Lees
Signed
3 years
January 2011
Leeds United
12
ENG
Hughes
Signed
1 year 2
June 2010
Leeds United

Questions and formulas:
Question: What source has delph as the name?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="delph"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F12,B2:B12="delph"),6))
Level: medium