Greeting!!
what I have
| shipping date | site | Subject ID | SiteIntialDate |
| 2017-03-01 | 1 | 1001 | 01-Mar-17 |
| 2017-03-01 | 1 | 1002 | . |
| 2017-03-07 | 1 | 1003 | . |
| 2018-11-14 | 1 | 1062 | . |
| 2018-11-19 | 1 | 1063 | . |
| 2018-12-02 | 1 | 1064 | . |
| 2018-01-09 | 2 | 2001 | 09-Jan-18 |
| 2018-02-02 | 2 | 2002 | . |
| 2018-03-05 | 2 | 2003 | . |
| 2018-12-19 | 2 | 2030 | . |
| 2019-01-03 | 2 | 2031 | . |
| 2017-07-07 | 3 | 3001 | 07-Jul-17 |
| 2017-11-29 | 3 | 3002 | . |
| 2017-12-12 | 3 | 3003 | . |
| 2017-09-28 | 4 | 4001 | 28-Sep-17 |
| 2017-12-14 | 4 | 4002 | . |
| 2017-12-20 | 4 | 4003 | . |
| 2018-02-01 | 4 | 4004 | . |
| 2018-02-05 | 4 | 4005 | . |
| 2018-03-28 | 4 | 4006 | . |
| 2018-05-14 | 4 | 4007 | . |
what I want
| Shipping date | site | Subject ID | SiteIntialDate |
| 2017-03-01 | 1 | 1001 | 01-Mar-17 |
| 2017-03-01 | 1 | 1002 | 01-Mar-17 |
| 2017-03-07 | 1 | 1003 | 01-Mar-17 |
| 2018-11-14 | 1 | 1062 | 01-Mar-17 |
| 2018-11-19 | 1 | 1063 | 01-Mar-17 |
| 2018-12-02 | 1 | 1064 | 01-Mar-17 |
| 2018-01-09 | 2 | 2001 | 09-Jan-18 |
| 2018-02-02 | 2 | 2002 | 09-Jan-18 |
| 2018-03-05 | 2 | 2003 | 09-Jan-18 |
| 2018-12-19 | 2 | 2030 | 09-Jan-18 |
| 2019-01-03 | 2 | 2031 | 09-Jan-18 |
| 2017-07-07 | 3 | 3001 | 07-Jul-17 |
| 2017-11-29 | 3 | 3002 | 07-Jul-17 |
| 2017-12-12 | 3 | 3003 | 07-Jul-17 |
| 2017-09-28 | 4 | 4001 | 28-Sep-17 |
| 2017-12-14 | 4 | 4002 | 28-Sep-17 |
| 2017-12-20 | 4 | 4003 | 28-Sep-17 |
| 2018-02-01 | 4 | 4004 | 28-Sep-17 |
| 2018-02-05 | 4 | 4005 | 28-Sep-17 |
| 2018-03-28 | 4 | 4006 | 28-Sep-17 |
| 2018-05-14 | 4 | 4007 | 28-Sep-17 |
Thanks
data have;
input shipping_date :yymmdd10. site $ SubjectID $ SiteIntialDate :date9.;
format shipping_date yymmdd10. SiteIntialDate date11.;
cards;
2017-03-01 1 1001 01-Mar-17
2017-03-01 1 1002 .
2017-03-07 1 1003 .
2018-11-14 1 1062 .
2018-11-19 1 1063 .
2018-12-02 1 1064 .
2018-01-09 2 2001 09-Jan-18
2018-02-02 2 2002 .
2018-03-05 2 2003 .
2018-12-19 2 2030 .
2019-01-03 2 2031 .
2017-07-07 3 3001 07-Jul-17
2017-11-29 3 3002 .
2017-12-12 3 3003 .
2017-09-28 4 4001 28-Sep-17
2017-12-14 4 4002 .
2017-12-20 4 4003 .
2018-02-01 4 4004 .
2018-02-05 4 4005 .
2018-03-28 4 4006 .
2018-05-14 4 4007 .
;
data want;
update have(obs=0) have;
by site;
output;
run;
data have;
input shipping_date :yymmdd10. site $ SubjectID $ SiteIntialDate :date9.;
format shipping_date yymmdd10. SiteIntialDate date11.;
cards;
2017-03-01 1 1001 01-Mar-17
2017-03-01 1 1002 .
2017-03-07 1 1003 .
2018-11-14 1 1062 .
2018-11-19 1 1063 .
2018-12-02 1 1064 .
2018-01-09 2 2001 09-Jan-18
2018-02-02 2 2002 .
2018-03-05 2 2003 .
2018-12-19 2 2030 .
2019-01-03 2 2031 .
2017-07-07 3 3001 07-Jul-17
2017-11-29 3 3002 .
2017-12-12 3 3003 .
2017-09-28 4 4001 28-Sep-17
2017-12-14 4 4002 .
2017-12-20 4 4003 .
2018-02-01 4 4004 .
2018-02-05 4 4005 .
2018-03-28 4 4006 .
2018-05-14 4 4007 .
;
data want;
update have(obs=0) have;
by site;
output;
run;
thank you @novinosrin, !!!
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