Table:
0
A
B
C
D
E
F
1
Team
Outgoing manager
Manner of departure
Date of vacancy
Replaced by
Date of appointment
2
Clyde
Joe Miller
Mutual consent
25 May
Colin Hendry
11 June
3
St. Johnstone
Owen Coyle
Mutual consent
22 November
Derek McInnes
27 November
4
Dunfermline Athletic
Stephen Kenny
Sacked
4 December
Jim McIntyre
3 January
5
Clyde
Colin Hendry
Resigned
18 January
John Brown
26 January
6
Greenock Morton
Jim McInally
Resigned
12 February
David Irons
19 February

Questions and formulas:
Question: What days is greenock morton vacant?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="Greenock Morton"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,A2:A6="Greenock Morton"),4))
Level: medium
Question: What are the dates of the outgoing manager colin hendry does appointments? 
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="Colin Hendry"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,B2:B6="Colin Hendry"),6))
Level: medium
Question: What teams does jim mcinally manage?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,B1="Jim McInally"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,B2:B6="Jim McInally"),1))
Level: medium
Question: What days are vacant that were replaced by john brown?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="John Brown"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,E2:E6="John Brown"),4))
Level: medium