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Posted 05-11-2021 09:06 AM
(4825 views)
How can I use lag over partition by in proc sql?
PROC SQL; CREATE TABLE WANT AS select t1.account_id from (select h1.account_id, lag(ACCOUNT_STATUS) over (partition by account_id order by ACCOUNT_CHANGE_DATE) as prev_status from HAVE h1 ) t1 where prev_status NOT = 'B1' and ACCOUNT_STATUS = 'B1' and account_change_date >= '1Dec2020'd and account_change_date < '1Jan2021'd; QUIT;
Thank you!
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WINDOW functions are not supported in Proc SQL yet .
lag(ACCOUNT_STATUS) over (partition by account_id order by ACCOUNT_CHANGE_DATE) as prev_status
This functionality can be achieved using Data Step.
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WINDOW functions are not supported in Proc SQL yet .
lag(ACCOUNT_STATUS) over (partition by account_id order by ACCOUNT_CHANGE_DATE) as prev_status
This functionality can be achieved using Data Step.
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The LAG() function will work in a data step.
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SAS Proc Sql also does not support "partition by" syntax.
SQL in general is not a sequential processing approach to data. It is based more on set operations if you remember those from junior high math classes. So "lag", which relies on a specific sequence of records, is not implemented for SQL.