Answer / ankit

it is depend upon my needs how to join these data set if we want to join data vertically then use set otherwise for horizontal i'll use merge.

Answer / charan araveti

Append/Set:
If you want to Add/Append data to Existed/Newly created
Dataset (With same variabls)

EX: you have DATA SETS Like JAN,FEB,MAR........,DEC.
and you want to create data set like "Sales_2010"
you have to use "SET/APPEND" Statements.

MERGE:
If you want add Existed variables to DataSet you have to use
Merge.
EX: If you 2 Dtasets of one person like Personal &
Professional and you want to all details in one dataset
means you have to use "Merge" with 'BY' Statement.

Answer / vimal

proc append is best to just combine two datasets.
it appends in bulk and without have to read and send to output. it just puts the dataset in data= to dataset in base=

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