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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