本文介绍了在 pandas 数据集上执行SQL查询的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个名为"df"的熊猫数据集.
I have a pandas data set, called 'df'.
我该如何执行以下操作;
How can I do something like below;
df.query("select * from df")
谢谢.
对于那些了解R的人来说,有一个名为sqldf的库,您可以在R中执行SQL代码,我的问题是,在python中是否有像sqldf这样的库
For those who know R, there is a library called sqldf where you can execute SQL code in R, my question is basically, is there some library like sqldf in python
推荐答案
这不是 pandas.query
应该做的,您可以查看包pandasql
(类似于R中的sqldf
)
This is not pandas.query
supposed to do , You can look at package pandasql
(same like sqldf
in R )
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
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