a*********7
发帖数: 2 | 1 To create a list of unique Customer_Id
values from the customer data set, which
of the following techniques can be used?
technique 1: proc SORT with NODUPKEY and OUT=
technique 2: data step with IF FIRST.Customer_Id=1
technique 3: proc SQL with the SELECT DISTINCT statement
A.only technique 1
B.techniques 1 and 2
C.techniques 1 and 3
D.techniques 1, 2, or 3
跟Crackman学sas里答案为C，说第二个方法需要实现对FIRST变量SORT， 但下载的答案
选D。我觉得也是D, 因为题目问那种方法，具体sort不sort是操作的具体步骤。大牛们
给个答案 | s***c
发帖数: 1664 | 2 前几天考试遇到这道题，题目改成了unsorted data set，选1，3
2必须先sort
【在 a*********7 的大作中提到】
: To create a list of unique Customer_Id
: values from the customer data set, which
: of the following techniques can be used?
: technique 1: proc SORT with NODUPKEY and OUT=
: technique 2: data step with IF FIRST.Customer_Id=1
: technique 3: proc SQL with the SELECT DISTINCT statement
: A.only technique 1
: B.techniques 1 and 2
: C.techniques 1 and 3
: D.techniques 1, 2, or 3
| a********e
发帖数: 7 | 3 那就明确了。谢谢！
【在 s***c 的大作中提到】
: 前几天考试遇到这道题，题目改成了unsorted data set，选1，3
: 2必须先sort
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