Do you need to combine data sets? How should you combine
data sets– MERGE or SET statements in DATA steps,PROC
APPEND,PROC SQL?
Answers were Sorted based on User's Feedback
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.
Is This Answer Correct ? | 4 Yes | 0 No |
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.
Is This Answer Correct ? | 4 Yes | 0 No |
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=
Is This Answer Correct ? | 0 Yes | 0 No |
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data data1; input dt account; format dt date9.; cards; 1745 1230 1756 1120 1788 1130 1767 1240 ; data data2; input startdt enddt total; format startdt date9. enddt date9.; cards; 1657 1834 12300 1557 1758 16800 1789 1789 12300 1788 1345 12383 1899 1899 13250 ; proc sql; create table data3 as select * from data1 as x left join data2 as y on x.dt>=y.startdt and x.dt<=y.enddt; quit; Here, we are getting cartision product. But,I want left join report consisting of this program. It should not get duplicate values. you can modify the program also.
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