Table:
0
A
B
C
D
E
F
G
1
Week
Date
Opponent
Result
Record
Game Site
Attendance
2
1
September 10, 1989
at Miami Dolphins
W 27–24
1–0
Joe Robbie Stadium
54,541
3
2
September 18, 1989
Denver Broncos
L 14–28
1–1
Rich Stadium
78,176
4
3
September 24, 1989
at Houston Oilers
W 47–41
2–1
Houston Astrodome
57,278
5
4
October 1, 1989
New England Patriots
W 31–10
3–1
Rich Stadium
78,921
6
5
October 8, 1989
at Indianapolis Colts
L 14–37
3–2
Hoosier Dome
58,890
7
6
October 16, 1989
Los Angeles Rams
W 23–20
4–2
Rich Stadium
76,231
8
7
October 22, 1989
New York Jets
W 34–3
5–2
Rich Stadium
76,811
9
8
October 29, 1989
Miami Dolphins
W 31–17
6–2
Rich Stadium
80,208
10
9
November 5, 1989
at Atlanta Falcons
L 28–30
6–3
Atlanta-Fulton County Stadium
45,267
11
10
November 12, 1989
Indianapolis Colts
W 30–7
7–3
Rich Stadium
79,256
12
11
November 19, 1989
at New England Patriots
L 24–33
7–4
Sullivan Stadium
49,663
13
12
November 26, 1989
Cincinnati Bengals
W 24–7
8–4
Rich Stadium
80,074
14
13
December 4, 1989
at Seattle Seahawks
L 16–17
8–5
Kingdome
57,682
15
14
December 10, 1989
New Orleans Saints
L 19–22
8–6
Rich Stadium
70,037
16
15
December 17, 1989
at San Francisco 49ers
L 10–21
8–7
Candlestick Park
60,927
17
16
December 23, 1989
at New York Jets
W 37–0
9–7
The Meadowlands
21,148

Questions and formulas:
Question: When did they play at Candlestick Park?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,F1="candlestick park"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G17,F2:F17="candlestick park"),2))
Level: medium