what is Difference between PROC SQL JOINS and MERGE?
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Answer / rajitha macherla
The resultant dataset depends on the input datasets.
In case of one to one and one to many both work
similarly,i.e. the resultant dataset is same.
But differs in case of many to many and non matching
datasets:
many to many:
ex: (merge on x) (proc sql)
X Y X Z X Y Z X Y Z
----- ------ ------- -------
1 A 1 F 1 A F 1 A F
1 C 1 R ---> 1 C R 1 A R
2 B 2 G 2 B G 1 C F
1 C R
2 B G
NON MATCHING DATA:
ex: (merge on x) (proc sql)
X Y X Z X Y Z X Y Z
----- ------ ------- -------
1 A 1 F 1 A F 1 A F
2 B 3 T ---> 2 B . 3 C T
3 C 4 G 3 C T
4 . G
| Is This Answer Correct ? | 28 Yes | 6 No |
Answer / siddu
Before doing the merge process we have to do sorting depended the key variable, but in proc sql joins no need to do sorting.
| Is This Answer Correct ? | 6 Yes | 0 No |
Answer / nrtya vardhanapu
merge is a statement which is used in the data step Whereas
join is a procedure which is used in the proc step. But the
outputs produced are the same !!!!
| Is This Answer Correct ? | 0 Yes | 13 No |
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