hi guys,'
i have a table of patient-id,date,and tests and i need to write a SQL statement that would count the number of distinct tests per patient (distinct= on a different date) but i dont actually understand what they asking me for.
Do they mean:
for id=22,count(distinct(tests))=1
for id=23,cont(distinct(tests))=5 and so on...?
or maybe sum(distinct(tests))=20
and sum(distinct(tests))=(10+50+100+120+180) or maybe neither?
22 29/12/1999 20
22 29/12/1999 20
23 01/11/1999 10
23 01/12/1999 10
23 08/12/1999 10
23 19/04/2000 50
23 20/06/2000 100
23 15/08/2000 120
23 10/09/2000 180
23 11/9/2000 180
23 12/9/2000 180
24 01/8/2001 160
24 01/8/2001 160
24 15/8/2001 160
24 01/1/2002 160
25 1/6/1999 10
25 2/6/1999 10
25 3/6/1999 10
25 19/4/2000 50
25 20/6/2000 100
25 15/8/2000 120
25 31/10/2000 180
25 28/11/2000 80
25 29/11/2000 80
25 30/11/2000 80
25 15/08/2001 160
25 01/1/2001 190
My guess would be that given the variables (patientId, testDate testId), the required counts would be given by:
proc sql;
create table want as
select patientId, count(*) as nbTests
from(
select unique patientId, testDate, testId
from have)
group by patientId;
select * from want;
quit;
patientId nbTests
-------------------
22 1
23 9
24 3
25 12
PG
My guess would be that given the variables (patientId, testDate testId), the required counts would be given by:
proc sql;
create table want as
select patientId, count(*) as nbTests
from(
select unique patientId, testDate, testId
from have)
group by patientId;
select * from want;
quit;
patientId nbTests
-------------------
22 1
23 9
24 3
25 12
PG
yea it does make sense.distinct patientid,date,test.Thanks PG
and if i want to write a SQL statement that would count the number of individuals who have the same testid value on at least 3 consecutive test dates. What would that be,any idea?
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