还有45题
to creat a list of unique customer_id values from the customer data set, which of the following techniques can be used?
1: proc sort with nodupkey and out=
2. data step with if first.customer_id=1
3. proc sql with the selcet distince statement
关于2, 需要对first变量sort 那么答案到底是 C 1 and 3 还是D 1 ,2 and 3 呢?
The word scanner does not recognize macro triggers that are enclosed in single quotation marks. Remember that if you need to reference a macro variable within a literal token, such as the title text in a TITLE statement, you must enclose the text string in double quotation marks or the macro variable reference is not resolved.