Table:
0
A
B
C
D
E
F
1
Match
Date
Competition or tour
Ground
Opponent
Score1
2
1
14 Jul 2007
—
A
Dagenham & Redbridge
2 - 0
3
2
17 Jul 2007
—
A
Sigma Olomouc
0 - 1
4
3
21 Jul 2007
—
A
Lazio
0 - 2
5
4
24 Jul 2007
—
A
Leyton Orient
1 - 1
6
5
25 Jul 2007
—
A
MK Dons
2 - 3
7
6
28 Jul 2007
—
A
Southend United
3 - 1
8
7
31 Jul 2007
—
A
Norwich City
2 - 1
9
8
4 Aug 2007
—
H
Roma
2 - 1

Questions and formulas:
Question: Which opponent has a date 21 jul 2007?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="21 jul 2007"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F9,B2:B9="21 jul 2007"),5))
Level: medium