Table:
0
A
B
C
D
E
1
church id
name
organized by
open date
continuation of
2
1
Pure Church of Christ
Wycam Clark
1831-01-01
Church of Christ
3
2
Independent Church
?�? Hoton
1832-01-01
Church of Christ
4
3
Church of Christ
Ezra Booth
1836-01-01
Church of the Latter Day Saints
5
4
Church of Christ (Parrishite)
Warren Parrish
1837-01-01
Church of the Latter Day Saints
6
5
Alston Church
Isaac Russell
1839-01-01
Church of Jesus Christ of Latter Day Saints
7
6
Church of Christ
William Chubby
1830-01-01
Church of Jesus Christ of Latter Day Saints
8
7
Church of Jesus Christ, the Bride, the Lamb's Wife
George M. Hinkle
1840-01-01
Church of Jesus Christ of Latter Day Saints
9
8
Church of Christ
Hiram Page
1842-01-01
Church of Jesus Christ of Latter Day Saints
10
9
True Church of Jesus Christ of Latter Day Saints
William Law
1844-01-01
Church of Jesus Christ of Latter Day Saints

Questions and formulas:
Question: How many churches opened before 1850 are there?
Formula: SUM(FILTER(A1, Year(D1)<1850))
Formula2: SUM(FILTER(A2:A10, Year(D1)<1850))
Level: easy
Question: Show the name, open date, and organizer for all churches.
Formula: CHOOSE({1,2,3},B1,D1,C1)
Formula2: CHOOSE({1,2,3},B2:B10,D2:D10,C2:C10)
Level: easy
Question: List all church names in descending order of opening date.
Formula: SORTBY(B1,D1,-1)
Formula2: SORTBY(B2:B10,D2:D10,-1)
Level: easy
Question: Show the opening year in whcih at least two churches opened.
Formula: LET(query1,SUMMARIZE(D1,SUMX(A1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(D2:D10,SUMX(A2:A10)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: Show the organizer and name for churches that opened between 1830 and 1840.
Formula: CHOOSE({1,2},FILTER(C1,(D1>=1830)*(D1<=1840)),FILTER(B1,(D1>=1830)*(D1<=1840)))
Formula2: CHOOSE({1,2},FILTER(C2:C10,(D2:D10>=1830)*(D2:D10<=1840)),FILTER(B2:B10,(D2:D10>=1830)*(D2:D10<=1840)))
Level: medium
Question: The number of churches opened before 1850.
Formula: SUM(FILTER(A1, Year(D1)<1850))
Formula2: SUM(FILTER(A2:A10, Year(D1)<1850))
Level: easy
Question: Ids and names of all churches opened on different dates
Formula: UNIQUE(HSTACK(B1,D1,A1))
Formula2: UNIQUE(HSTACK(B2:B10,D2:D10,A2:A10))
Level: easy
Question: Church ids and names by opening dates most recent to earliest.
Formula: SORT(UNIQUE(HSTACK(A1,B1,D1)), 3, -1)
Formula2: SORT(UNIQUE(HSTACK(A2:A10,B2:B10,D2:D10)), 3, -1)
Level: medium
Question: The dates when at least 2 churches opened.
Formula: LET(query1,SUMMARIZE(D1,SUMX(A1)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Formula2: LET(query1,SUMMARIZE(D2:D10,SUMX(A2:A10)),FILTER(query1,CHOOSECOLS(query1,3)>=2))
Level: hard
Question: Names and ids for churches opened between 1830 and 1840
Formula: LET(query1,FILTER(A1:E1,(Year(D1)<1841)*(Year(D1)>=1830)),UNIQUE(CHOOSECOLS(query1,2,1)))
Formula2: LET(query1,FILTER(A2:E10,(Year(D1)<1841)*(Year(D1)>=1830)),UNIQUE(CHOOSECOLS(query1,2,1)))
Level: hard
Question: The ids and names of churches opened on all dates.
Formula: UNIQUE(HSTACK(B1,D1,A1))
Formula2: UNIQUE(HSTACK(B2:B10,D2:D10,A2:A10))
Level: easy
Question: The ids, names and open dates of churches opened from most recent to earliest.
Formula: LET(a,HSTACK(A1,B1,D1),b,A1,c,CHOOSECOLS(TAKE(SORT(UNIQUE(HSTACK(A1,D1)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Formula2: LET(a,HSTACK(A2:A10,B2:B10,D2:D10),b,A2:A10,c,CHOOSECOLS(TAKE(SORT(UNIQUE(HSTACK(A2:A10,D2:D10)), 2, -1), 1),1),UNIQUE(FILTER(a,NOT(ISNA(XLOOKUP(b,c,c))))))
Level: hard
Question: the name and id of the church opened between 1830 and 1840.
Formula: LET(query1,FILTER(A1:E1,(Year(D1)<1841)*(Year(D1)>=1830)),UNIQUE(CHOOSECOLS(query1,2,1)))
Formula2: LET(query1,FILTER(A2:E10,(Year(D1)<1841)*(Year(D1)>=1830)),UNIQUE(CHOOSECOLS(query1,2,1)))
Level: hard