Table:
0
A
B
C
D
E
1
Name
Type
Year Built
Where Built
Initial Owners
2
Mountain Buck
side
1857
Portland
Ruckle & Olmstead
3
Hassaloe
stern
1858
Cascades, Washington
Bradford Bros.
4
Carrie Ladd
stern
1858
Oregon City
Jacob Kamm & John C. Ainsworth
5
Julia(Barclay)
stern
1858
Port Blakely
Oregon Steam Navigation Co.
6
Wasco
stern
1858
Port Blakeley
Oregon Steam Navigation Co.

Questions and formulas:
Question: Where was something built earlier than 1858?
Formula: LET(query1,SUMMARIZE(D1,SUMX(C1)),FILTER(query1,CHOOSECOLS(query1,2)<1858))
Formula2: LET(query1,SUMMARIZE(D2:D6,SUMX(C2:C6)),FILTER(query1,CHOOSECOLS(query1,2)<1858))
Level: hard
Question: What was built in 1857?
Formula: LET(query1,SUMMARIZE(A1,SUMX(C1)),FILTER(query1,CHOOSECOLS(query1,2)=1857))
Formula2: LET(query1,SUMMARIZE(A2:A6,SUMX(C2:C6)),FILTER(query1,CHOOSECOLS(query1,2)=1857))
Level: hard
Question: Who were the initial owners of Wasco in 1858?
Formula: LET(query1,LET(query1,FILTER(A1:E1,A1="wasco"),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,3)))),FILTER(query1,CHOOSECOLS(query1,2)=1858))
Formula2: LET(query1,LET(query1,FILTER(A2:E6,A2:A6="wasco"),SUMMARIZE(CHOOSECOLS(query1,5),SUMX(CHOOSECOLS(query1,3)))),FILTER(query1,CHOOSECOLS(query1,2)=1858))
Level: hard
Question: What was the type of boat built in Port Blakeley
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="port blakeley"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,D2:D6="port blakeley"),2))
Level: medium