Table:
0
A
B
C
D
E
F
1
No. in season
No. disc
Title
Directed by
Written by
Original air date
2
1
1
"The Serpent's Lair (4)"
Jonathan Glassner
Brad Wright
June26,1998 ( Showtime )
3
2
1
"In the Line of Duty"
Martin Wood
Robert C. Cooper
July3,1998 (Showtime)
4
3
1
"Prisoners"
David Warry-Smith
Terry Curtis Fox
July10,1998 (Showtime)
5
6
2
"Thor's Chariot"
William Gereghty
Katharyn Powers
July31,1998 (Showtime)
6
8
2
"Family"
William Gereghty
Katharyn Powers
August14,1998 (Showtime)
7
9
2
"Secrets"
Duane Clark
Terry Curtis Fox
August21,1998 (Showtime)
8
10
3
"Bane"
David Warry-Smith
Robert C. Cooper
September25,1998 (Showtime)
9
11
3
"The Tok'ra (Part 1)"
Brad Turner
Jonathan Glassner
October2,1998 (Showtime)
10
12
3
"The Tok'ra (Part 2)"
Brad Turner
Jonathan Glassner
October9,1998 (Showtime)
11
13
3
"Spirits"
Martin Wood
Tor Alexander Valenza
October23,1998 (Showtime)
12
14
3
"Touchstone"
Brad Turner
Sam Egan
October30,1998 (Showtime)
13
15
4
"A Matter of Time"
Jimmy Kaufman
Story: Misha Rashovichm Teleplay: Brad Wright
January29,1999 (Sky One)
14
17
4
"Serpent's Song"
Peter DeLuise
Katharyn Powers
February12,1999 (Sky One)
15
19
5
"One False Step"
William Corcoran
Michael Kaplan & John Sanborn
February19,1999 (Sky One)
16
20
5
"Show and Tell"
Peter DeLuise
Jonathan Glassner
February26,1999 (Sky One)
17
21
5
"1969"
Charles Correll
Brad Wright
March5,1999 (Sky One)

Questions and formulas:
Question: How many original air dates were there for episode 17?
Formula: ROWS(UNIQUE(FILTER(F1, A1=17)))
Formula2: ROWS(UNIQUE(FILTER(F2:F17, A2:A17=17)))
Level: medium
Question: When did the episode titled "Prisoners" first air?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="Prisoners"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F17,C2:C17="Prisoners"),6))
Level: medium