number builder entered service withdrawn notes
number
builder
entered service
withdrawn
notes
number
number parsed year month day
number parsed year month day
number text date date text
439 nzr addington 9-1-1909 2-3-1957 converted to 4-cylinder simple, 6-1949
what is the total number of different builders in the table ?
WP VBD-AUX DT JJ NN IN JJ NNS IN DT NN .
1
Keyword Keyword Keyword Keyword Column Keyword Keyword Keyword
select count ( distinct c2 ) from w
None None Keyword Keyword Keyword Keyword Keyword Column None None None None
['agg', 'agg_count'] ['agg', 'agg_count'] ['agg', 'agg_count'] ['agg', 'agg_count'] ['conj', 'conj_or'] c2