Get count per each group using t-sql

Hi All, I have a table with 5 columns and my source data looks like this...
ID    Doctor     NurseType    VisitID      Date
1      Sam       Main-Nurse      10        09/23/2013
1      Tom       Sub-Nurse       10        09/23/2013
1                   Sub-Nurse       10        09/23/2013
2      Ryan      Sub-Nurse       24        10/29/2013
2      Ron       Main-Nurse      24        10/29/2013
3                   Main-Nurse      35        04/12/2014
3                   Main-Nurse      35        04/12/2014
3                   Sub-Nurse       35        04/12/2014
3                    Main-Nurse      40        05/12/2014
3       Greg      Main-Nurse      40        05/12/2014
3                    Sub-Nurse       40        05/12/2014
4       susan     Main-Nurse      45        06/12/2014
4       Roby       Main-Nurse      45        06/12/2014
4                     Sub-Nurse       45        06/12/2014
I want output to be in this format. I want number of doctors present in each ID group per each date using t-sql.
Output:
ID      Comments      VisitID      Date
1       2 doctors       10        09/23/2013
2       2 doctors       24        10/29/2013
3       0 doctor        35        04/12/2014
3       1 doctor        40        05/12/2014
4       1 doctor        45        06/12/2014
Note:
1)NurseType column always will have Main-Nurse and sub-nurse values.Each ID group will have minimum one main and sub-nurses.
2) In the above sample date , Id=3 repeated 2 times becoz visitID and date is different.
3) Also in ID=4(records), even though we have 2 doctors susan and roby we consider them as one doctor becoz NurseType is same(main-nurse).
4) Values in the comments field will always be 2 doctors , 1 doctor and 0 doctor. Rules for populating this column
a) In a ID group if Main-Nurse and sub-nurse has nay doctors then will show as 2 doctors.
b) In a ID group if Main-Nurse or sub-nurse (any one) has doctor then will show as 1 doctor.
c) In a ID group if Main-Nurse and sub-nurse both doesn't have any doctors then will show as 0 doctor
Create statement:
Create table sample ( ID Int null ,Doctor varchar(25) null,NurseType varchar(20) null ,VisitID int null,Date datetime null)
Insert statement:
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (1,'Sam,Main-Nurse' , 10 , '09/23/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (1,'Tom,Sub-Nurse' , 10 , '09/23/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (1, ,'Sub-Nurse' , 10 , '09/23/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (2,'Ryan','Sub-Nurse'   , 24 ,10/29/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (2,'Ron' , 'Main-Nurse' ,     24,'10/29/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, , 'Main-Nurse' ,     35 ,'04/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, , 'Main-Nurse' ,     35 ,'04/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, , 'Sub-Nurse' ,      35 ,'04/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, , Main-Nurse',      40 ,'05/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3,'Greg', 'Main-Nurse',      40 ,'05/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, , 'Sub-Nurse' ,      40,'05/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (4, 'susan' , 'Main-Nurse' ,      45,'06/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (4, 'Roby' , 'Main-Nurse' ,      45,'06/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (4, , 'sub-Nurse' ,      45,'06/12/2014')
Thanks.
sql

I had to correct the sample script a bit. The query you are asking for comes after the inserts.
Create table sample ( ID Int null ,Doctor varchar(25) null,NurseType varchar(20) null ,VisitID int null,Date datetime null)
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (1,'Sam','Main-Nurse' , 10 , '09/23/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (1,'Tom','Sub-Nurse' , 10 , '09/23/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (1, NULL,'Sub-Nurse' , 10 , '09/23/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (2,'Ryan','Sub-Nurse' , 24 ,'10/29/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (2,'Ron' , 'Main-Nurse' , 24,'10/29/2013')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, NULL, 'Main-Nurse' , 35 ,'04/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, NULL, 'Main-Nurse' , 35 ,'04/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, NULL, 'Sub-Nurse' , 35 ,'04/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, NULL, 'Main-Nurse', 40 ,'05/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3,'Greg', 'Main-Nurse', 40 ,'05/12/2014')
Insert into sample (ID,Doctor,NurseType,VisitID,Date) values (3, NULL , 'Sub-Nurse' , 40,'05/12/2014')
go
SELECT ID, COUNT(Doctor) DoctorCnt, VisitID, Date
FROM sample
GROUP BY ID, VisitID, Date
go
DROP TABLE sample
Erland Sommarskog, SQL Server MVP, [email protected]

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B fl432 LGW XYZ 7
B fl432 MAN ABC 8
.... etc.
I would need to return one row for Client A and one row for Client B (etc.) but find that I can't use the MIN function because it would return the MIN value for each column (i.e. mix up the rows). I also can use the rownum=1 because this would only return one row rather than one row per group (i.e. per client).
I have been investigating and most postings seem to say that it needs a second query to look up the first row for each grouping. This is a solution which would not really be practical because my query is already quite complex and incorporating duplicate subqueries would just make the whole thing much to cumbersome.
So what I really new is a "MIN by group" or a "TOP by group" or a "ROWNUM=1 by group" function.
Can anyone help me with this? I'm sure that there must be a command to handle this.
Regards and any thanks,
Alan Searle
Cologne, Germany

Something like this:
select *
from (
   select table1.*
   row_number() over (partition by col1, col2 order by col3, col4) rn
   from table1
where rn = 1In the "partition by" clause you place what you normally would "group by".
In the "order by" clause you define which will have row_number = 1.
Edit:
PS. The [url http://download.oracle.com/docs/cd/E11882_01/server.112/e17118/functions004.htm#i81407]docs have more examples on using analytical functions ;-)
Edited by: Kim Berg Hansen on Sep 16, 2011 10:46 AM

Use of SQL Profiles where each schema has very different data distribution and volumes

Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
Our architecture has multiple client schemas in the same database. Each schema has the same code base (tables, procedures etc) but each client's data is very different in terms of volumes and skew/distribution per table. This architecture was done based on cost - I know it's not ideal but it can't change.....
I am fairly seasoned with performance management and so know the usual tricks of when to eat up the table using parallel full table scans etc. I couldn't further optimise a given stmt for our largest table. I'll call it TSPCI and it has monthly partitions (2 years) and totals about 35Gb in the largest client schema.
Anyway, I was surprised when ADDM suggested that I could achieve 98% improvement if I were to use a given SQL Profile. Great?
So, here's my issue - I've found that the same SQL_ID is shared across all those different client schemas: I can't see how to get it to pick/use the SQL Profile in only a particular client schema - let's call it NEX - and not in another (lets call it COL).
If I generate a SQL Profile as NEX, has it analysed and built the SQL Profile based on the NEX schema and is it therefore invalid/undesirable to have that SQL Profile used in the COL schema??
I suppose that I could add a small change (say /*+ NEX */) to the SQL in the NEX schema to make the given sql unique there and then generate a SQL Profile for that..........
What am I missing here?

Well, I can confirm the behaviour: accept a SQL Profile for a given SQL in one schema and verified that it is used in another schema (where the data volume and distribution is very different).
I can also confirm the workaround - simply add a hint to the SQL to make it unique such that I could use different sql profiles for the otherwise exact same sql in different schemas.
I'm happy enough with this workaround but I'll leave this thread unanswered in case someone can suggest a better approach.

Get count per each group using t-sql

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