python - Pyodbc extracts only top three rows -


i making transition r python , flat files relational databases, ugly.

after establishing connection database using pyodbc, use pandas extract tables need. know fact data table need have @ least 4000 rows keep getting 3 rows. pretty sure it's option im not specifying correctly, it's not obvious going wrong. 

    import pyodbc      import pandas pd     pandas import *      cnxn = pyodbc.connect('dsn=mydsn')      hdem = pd.read_sql('select * mytable', cnxn)     hdem.shape

where going wrong here? many in advance.


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