从pandas中的2个数据帧映射数据

Question

我有两个需要映射的数据帧，最终输出应该是这样的。

  

输入1

LPAR    DC
A       LA
B       NY
C       CT
D       VA
E       WO

  

输入2

LPAR    PROD
A       Microsoft
A       Symantec
A       Vmware
B       Compuware
C       BMC
B       CA

  

最终输出

LPAR    DC  PROD
A       LA  Microsoft
A       LA  Symantec
A       LA  Vmware
B       NY  Compuware
B       NY  CA
C       CT  BMC
D       VA  
E       WO  

Answer 1

您可fillna两个DataFrames和dict1 = {'LPAR': ['A', 'B', 'C', 'D', 'E'], 'DC': ['LA', 'NY', 'CT', 'VA', 'WO']} df1 = pd.DataFrame(dict1) dict2 = {'LPAR': ['A', 'A', 'A', 'B', 'B', 'C'], 'PROD': ['Microsoft', 'Symantec', 'Vmware', 'Compuware', 'CA', 'BMC']} df2 = pd.DataFrame(dict2) df3 = df1.merge(df2, on='LPAR', how='outer').fillna('') 空字符串

Select t.*
from Table t
Where (Start_time <= End_time and MyTime >= Start_Time and MyTime <  End_Time) or
      (Start_time > End_time and MyTime < Start_Time and MyTime >=  End_Time);