在SAS中通过另一个数据集过滤数据集

Question

我有以下两个数据集。我怎样才能排除这些观察结果DATA1在DATA2

data DATA1; 
    input Name $ 1-25; 
    datalines; 
Vincent, Martina 
Phillipon, Marie-Odile  
Gunter, Thomas    
Harbinger, Nicholas  
Benito, Gisela    
Rudelich, Herbert   
Sirignano, Emily   
Morrison, Michael   
; 
run; 

data DATA2; 
    input Name $ 1-25; 
    datalines; 
Vincent, Martina 
Morrison, Michael   
; 
run; 

Answer 1

典型的例子存在，并经常讨论（这是最有效的）的LEFT JOIN NULL vs. NOT IN vs NOT EXISTS的SQL查询。

考虑PROC SQL相当于解决方案：

proc sql; 
    create table Data3 as 
     select Data1.Name 
      from Data1 
     left join Data2 on Data1.Name = Data2.Name 
      where Data2.Name is null; 
quit; 

proc sql; 
    create table Data4 as 
     select Data1.Name 
      from Data1 
      where Data1.Name 
     not in (select Data2.Name from Data2); 
quit; 

proc sql; 
    create table Data5 as 
     select Data1.Name 
      from Data1 
      where not exists 
     (select Data2.Name from Data2 
      where Data1.Name = Data2.Name); 
quit; 

输出

Name 
Phillipon, Marie-Odile 
Gunter, Thomas 
Harbinger, Nicholas 
Benito, Gisela 
Rudelich, Herbert 
Sirignano, Emily