Table:
0
A
B
C
D
E
F
1
School
Location
Mascot
County
Year Joined
Year Left
2
Barr Township
Montgomery
Vikings
14 Daviess
1939
pre-1958
3
Ellettsville
Ellettsville
Golden Eagles
53 Monroe
1939
1964
4
Loogootee
Loogootee
Lions
51 Martin
1939
1970
5
Oolitic
Oolitic
Bearcats
47 Lawrence
1939
1974
6
Plainville
Plainville
Midgets
14 Daviess
1939
pre-1958
7
Shoals *
Shoals
Jug Rox
51 Martin
1939 1962
pre-1958 1979
8
West Baden
West Baden
Sprudels
59 Orange
1939
pre-1958
9
Central (Switz City)
Switz City
Tigers
28 Greene
pre-1958
1990
10
Needmore
Needmore
Hilltoppers
47 Lawrence
pre-1958
1974
11
Odon
Odon
Bulldogs
14 Daviess
pre-1958
1968
12
Shawswick
Shawswick
Farmers
47 Lawrence
pre-1958
1974
13
Spencer
Spencer
Cops
60 Owen
pre-1958
1970
14
Worthington
Worthington
Ramblers
28 Greene
pre-1958
1990
15
Edgewood
Ellettsville
Mustangs
53 Monroe
1964
1970
16
L & M
Marco
Braves
28 Greene
1968
1990

Questions and formulas:
Question: Which year did the school with the mascot of the Vikings join?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="vikings"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F16,C2:C16="vikings"),5))
Level: medium