怎樣像SQL一樣把兩個表(Dataframe) join在一起
select df1.*, df2.col3 from df1 left join df2 on df1.col1 = df2.col1
可以用dataframe里的merge method
import pandas as pd
# Sample data in df1 and df2
data1 = {'col1': ['A', 'B', 'C'],
'col2': [100, 200, 300]}
df1 = pd.DataFrame(data1)
data2 = {'col1': ['A1', 'A2', 'A3'],
'col3': [150, 250, 350]}
df2 = pd.DataFrame(data2)
# Perform a left join on "symbol" column
result_df = df1.merge(df2, on='col1', how='left')
print(result_df)
