need help a query in sql server 2008 -

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hi have doubt in sql server 

table : patient patientno   | refdoctor| loccode | status | sdate 100         |  31      |10       | 1      | 2012-05-03  100         | 32       |10       | 1      |1997-02-04 100         | 36       |10       | 1      |2014-09-16 100         |35        |10       | 1      |2013-05-03 100         | 50       |10       | 1      | 1988-05-08 100         | 20       |10       | 2      |2015-02-05  table : targetpatient  patientno   | refdoctor| loccode | status | sdate 100         | 21       | 10      | 2      | 2004-05-18 100         | 23       | 10      | 2      |2005-07-25 100         | 24       | 10      | 2      | 2006-06-22 100         | 26       | 10      | 2      |2012-05-14 100         | 28       |10       | 2      |2013-05-03 100         |29        |10       | 2      | 2014-09-26 100         | 33       | 10      | 2      | 2012-10-22 100         | 39       | 10      | 2      |2002-12-13 100         |41        | 10      | 2      |2012-05-13

here want output patient table relates status

statusvalue=5's sdate less or equal checkvalue=2's sdate , difference between dates should less 30days given count if condition not fall count must return zero(0)

select  o.patientno,o.loccode,o.status,o.sdate, count(*) cnt patient o join targetpatient t on o.patientno=t.patientno , o.loccode=t.loccode , o.status in('1') , t.status in('2') ,  o.sdate<=t.sdate , datediff(dd,o.sdate,t.sdate)<=30 group o.patientno,o.loccode,o.status,o.sdate  based on above query got result below:  patientno   |  loccode | status | sdate      | count 100         | 10       |  1     |2012-05-03  | 2 100         | 10       | 1      |2013-05-03  | 1 100          | 10      | 1      |2014-09-16  | 1  want expected result below   patientno   |  loccode | status | sdate      | count 100         | 10       |  1     |2012-05-03  | 2 100         | 10       | 1      |2013-05-03  | 1 100         | 10       | 1      |2014-09-16  | 1 100         | 10       | 1      | 1997-02-04 | 0 100         | 10       |1       | 1988-05-08 | 0

please tell me how write query achive task in sql server .

if want include records doesn't have matches in joined table you'll want use left join instead , count on column in joined table instead this:

select o.patientno,o.loccode,o.status,o.sdate, count(t.sdate) cnt patient o  left join targetpatient t on o.patientno = t.patientno                           , o.loccode = t.loccode                           , o.status in('1')                           , t.status in('2')                           , o.sdate <= t.sdate                          , datediff(dd,o.sdate,t.sdate) <= 30 group o.patientno,o.loccode,o.status,o.sdate

a left join return rows table on left side (patient in case) plus matching rows right-hand side table. rows doesn't have matches in right-hand side table null values.


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