Table:
0
A
B
C
D
E
F
1
Name
County
Location
Built
Length (ft)
Spans
2
Biedler Farm
Rockingham
Broadway
1896
93
Smith Creek
3
Bob White
Patrick
Woolwine
1921
80
Smith River
4
C.K. Reynolds
Giles
Newport
1919
36
Sinking Creek
5
Humpback
Alleghany
Covington
1857
109
Dunlap Creek
6
Jack's Creek
Patrick
Woolwine
1914
48
Smith River
7
Link Farm
Giles
Newport
1912
49
Sinking Creek
8
Meem's Bottom
Shenandoah
Mount Jackson
1894
204
North Fork of the Shenandoah River
9
Sinking Creek
Giles
Newport
ca. 1916
71
Sinking Creek

Questions and formulas:
Question: What spans were built in 1896?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1=1896),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F9,D2:D9=1896),6))
Level: medium
Question: Who has a length of 71 ft?
Formula: LET(query1,SUMMARIZE(A1,SUMX(E1)),FILTER(query1,CHOOSECOLS(query1,2)=71))
Formula2: LET(query1,SUMMARIZE(A2:A9,SUMX(E2:E9)),FILTER(query1,CHOOSECOLS(query1,2)=71))
Level: hard
Question: Where was the county of rockingham?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="rockingham"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F9,B2:B9="rockingham"),3))
Level: medium