pythonsqlpandas

Executing an SQL query on a Pandas dataset

I have a Pandas dataset called df. How can I do:

df.query("select * from df")
Solution

  • This is not what pandas.query is supposed to do. You can look at package pandasql (same like sqldf in R )

    Update: Note pandasql hasn't been maintained since 2017. Use another library from an answer below.

    import pandas as pd
import pandasql as ps

df = pd.DataFrame([[1234, 'Customer A', '123 Street', np.nan],
               [1234, 'Customer A', np.nan, '333 Street'],
               [1233, 'Customer B', '444 Street', '333 Street'],
              [1233, 'Customer B', '444 Street', '666 Street']], columns=
['ID', 'Customer', 'Billing Address', 'Shipping Address'])

q1 = """SELECT ID FROM df """

print(ps.sqldf(q1, locals()))

     ID
0  1234
1  1234
2  1233
3  1233

    Update 2020-07-10

    update the pandasql

    ps.sqldf("select * from df")