Table:
0
A
B
C
D
E
F
G
H
1
Ship
Laid down
Builder
Engine-builder
Launched
Completed
Disposition
Fate
2
Comus
17 August 1876
John Elder
John Elder
3 April 1878
23 October 1879
Struck 1902
Sold for breaking 1904
3
Curacoa
17 August 1876
John Elder
Humphrys, Tennant & Company
18 April 1878
24 February 1880
Seagoing tender
Sold for breaking 1904
4
Champion
17 August 1876
John Elder
John Elder
1 July 1878
7 December 1880
Stokers' training ship
Sold for breaking 1919
5
Cleopatra
17 August 1876
John Elder
Humphrys, Tennant & Company
1 August 1878
24 August 1880
Training ship; overflow hulk
Sold 1931, broken up 1933
6
Carysfort
17 August 1876
John Elder
John Elder
26 September 1878
15 September 1880
Paid off 1901
Sold for breaking 1899
7
Conquest
17 August 1876
John Elder
Humphrys, Tennant & Company
28 October 1878
18 April 1885
Paid off 1894
Sold for breaking 1899
8
Constance
14 September 1878
Chatham
John Penn and Son
9 June 1880
3 October 1882
In reserve 1889
Sold for breaking 1899
9
Canada
7 July 1879
Portsmouth
J. & G. Rennie
26 August 1881
1 May 1883
In reserve 1896
Sold for breaking ca. 1898

Questions and formulas:
Question: When was the Carysfort launched?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:H1,A1="Carysfort"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:H9,A2:A9="Carysfort"),5))
Level: medium
Question: When was the stokers' training ship launched?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:H1,G1="Stokers' training ship"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:H9,G2:G9="Stokers' training ship"),5))
Level: medium
Question: How many ships were named Carysfort?
Formula: ROWS(UNIQUE(FILTER(F1, A1="Carysfort")))
Formula2: ROWS(UNIQUE(FILTER(F2:F9, A2:A9="Carysfort")))
Level: medium