Table:
0
A
B
C
D
E
F
G
1
Ch №
Channel
Channel content
Transmission
Format
Launch Date
Licence
2
1 (A); 81 (D)
TVB Jade
TVB's main Chinese ( Cantonese ) channel.
Analog & Digital
SDTV
19 November 1967
TVB
3
2 (A); 11 (D)
ATV Home
ATV's main Chinese (Cantonese) channel.
Analog & Digital
SDTV
29 May 1957
ATV
4
3 (A); 84 (D)
TVB Pearl
TVB's main English channel.
Analog & Digital
HDTV
19 November 1967
TVB
5
4 (A); 16 (D)
ATV World
ATV's main English channel.
Analog & Digital
SDTV
29 May 1957
ATV
6
32 (D)
RTHK 1
RTHK's main Cantonese and English channel.
Digital
HDTV
9 January 2013
RTHK
7
83 (D); 522 (M)
TVB iNews
A 24-hour news channel broadcasting in Cantonese.
Digital & Mobile
HDTV
11 November 2008
TVB

Questions and formulas:
Question: How many launch dates are there for digital transmission?
Formula: ROWS(UNIQUE(FILTER(F1, D1="Digital")))
Formula2: ROWS(UNIQUE(FILTER(F2:F7, D2:D7="Digital")))
Level: medium