Table:
0
A
B
C
D
E
1
Year
Competition
Venue
Position
Event
2
2005
European U23 Championships
Erfurt , Germany
2nd
4 x 400 m relay
3
2006
Commonwealth Games
Melbourne , Australia
4th
4 x 400 m relay
4
2007
World Championships
Osaka , Japan
4th (heats)
400 m
5
2007
World Championships
Osaka , Japan
6th
4 x 400 m relay
6
2008
Olympic Games
Beijing , China
8th (semis)
400 m
7
2008
Olympic Games
Beijing , China
4th
4 x 400 m relay

Questions and formulas:
Question: How many years was the 400 m event in the olympic games?
Formula: ROWS(UNIQUE(FILTER(A1, (B1="olympic games")*(E1="400 m"))))
Formula2: ROWS(UNIQUE(FILTER(A2:A7, (B2:B7="olympic games")*(E2:E7="400 m"))))
Level: medium