year date venue city country notes
year
date
venue
city
country
notes
number
minimum_number minimum_parsed minimum_day minimum_month minimum_year maximum_number maximum_parsed maximum_day maximum_month maximum_year
address
number timespan text address text text
2012 oct 27 - 31 nara prefectural new public hall nara japan isbn 1-59593-447-2
how many times was a conference held in san francisco ?
WRB JJ NNS VBD-AUX DT NN VBN IN NNP NNP .
2
select count ( * ) from w where c4_address = 'san francisco'