Table:
0
A
B
C
D
E
F
1
Race Name
Circuit
Date
Winning driver
Constructor
Report
2
I Rostock Osthafenkurs
Rostock
20 April
Paul Greifzu
BMW - Eigenbau
Report
3
I Bernau Autobahnschleife
Bernau
4 May
Rudolf Krause
BMW - Reif
Report
4
I Dessau Autobahnspinne
Dessau
11 May
Fritz Riess
Veritas-Meteor
Report
5
III Leipzig Stadtparkrennen
Leipzig
2 June
Edgar Barth
IFA - Kollektiv
Report
6
III Strassen-Rennen Halle-Saale-Schleife
Halle-Saale-Schleife
8 June
Edgar Barth
IFA - Kollektiv
Report
7
I Strassen-rennen Leipzig
Leipzig
17 August
Hans Stuck
AFM - BMW
Report
8
V DMV Grenzlandringrennen
Grenzlandring
31 August
Toni Ulmen
Veritas
Report

Questions and formulas:
Question: How many winners did I Dessau Autobahnspinne have?
Formula: ROWS(UNIQUE(FILTER(D1, A1="I Dessau Autobahnspinne")))
Formula2: ROWS(UNIQUE(FILTER(D2:D8, A2:A8="I Dessau Autobahnspinne")))
Level: medium
Question: What is the date on which a race was run at Halle-Saale-Schleife circuit?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="Halle-Saale-Schleife"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F8,B2:B8="Halle-Saale-Schleife"),3))
Level: medium
Question: How many races take place in Dessau circuit?
Formula: ROWS(UNIQUE(FILTER(A1, B1="Dessau")))
Formula2: ROWS(UNIQUE(FILTER(A2:A8, B2:B8="Dessau")))
Level: medium
Question: Which races did Paul Greifzu win?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,D1="Paul Greifzu"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F8,D2:D8="Paul Greifzu"),1))
Level: medium