I have the following two datasets. I want to delete the lines from A with dates that falls within the in-out period in file B. File A SEQ ID date var1
1 A12 03JAN04 242
2 A12 01FEB06 356
3 A12 06JAN08 325
4 A12 28DEC09 123
5 B34 06MAY03 985
6 B34 13JUN03 198
7 B34 10MAY05 241
8 C56 09NOV10 155
9 C56 19OCT13 352 File B ID date_in date_out
A12 01JAN04 04JAN04
A12 05FEB08 08FEB08
B34 03MAY03 06MAY03
B34 09MAY05 19MAY05
C56 12JUL12 18JUL12 For example, for ID=A12, his first obs falls within 01JAN04-04JAN04, thus I delete that obs, but keep the rest. Essentially, I should get the following results SEQ ID date var1
2 A12 01FEB06 356
3 A12 06JAN08 325
4 A12 28DEC09 123
6 B34 13JUN03 198
8 C56 09NOV10 155
9 C56 19OCT13 352 Both file A and B has multiple records per ID, and the between in-out period in file B is not alway constant. I don't have a lot experience with data manipulation in SAS, I'm really clueless about where to start, eg. should I write a macro that loops through both file some how? or use SQL somehow? I would greatly appreciate some advice on how to approach this problem. Thanks!
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