j******n 发帖数: 7 | 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
前辈答案选的是D,不过他本人也不确定。我会选C。求教。谢谢 | A*******s 发帖数: 3942 | 2 严格说来,得用proc sort and data step,by statement and first.var variable...
不过如果答案是C的话,只能说出题的人太无聊了。
【在 j******n 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.
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