使用 Concatenate 函数比较 SAS Data Step 和 PROC SQL

Question

Following is the Data Step I am trying to work on. I am a beginner in SAS. I want to compare the performance of SAS DATA Step and PROC SQL using concatenation. I tried to do it but i am not getting the same output for the DATA step and proc SQL. Hence, i cant compare the performance- which one is better? eg-> I tried concatenating Ridings (dataset) and REsults (dataset). But output was different. Can somebody help me with this? Link for reference

Answer 1

SQL data stacking (or what you might call concatenation) is accomplished with a UNION statement. However, UNION will remove duplicates. Try UNION ALL to maintain any duplicates that occur in the stacked data.

In SAS the highest performing operation for data stacking might be PROC APPEND .