How many networks one are there that have one channel number 7?
Channel Band Video Frequency Audio Frequency Station Network Transmission Format Status
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1-160728-4
7 UHF 189.250- MHz 194.750- MHz TV1 RTM Analog SDTV Public
27 UHF 519.250- MHz 524.750- MHz TV2 RTM Analog SDTV Public
29 UHF 535.250- MHz 540.750- MHz TV3 MPB Analog SDTV Commercial
37 UHF 599.250- MHz 604.750- MHz NTV7 MPB Analog SDTV Commercial
44 UHF 655.250- MHz 660.750- MHz 8TV MPB Analog SDTV Commercial
48 UHF 687.250- MHz 692.750- MHz TV9 MPB Analog SDTV Commercial
table_160728_4
SELECT COUNT Network FROM table WHERE Channel = 7
7