I am struggling with a SQL query in SQL Server - sql

Question

From one table (i.e. tblCases), I can count and group each protocol based on its ID for a given date interval:
ALTER PROCEDURE [dbo].[sp_CountAndGroupByProtocol]
(#startDate datetime, #endDate datetime)
AS
BEGIN
SELECT
COUNT(C.protocolID) AS total, protocolID
FROM
tblCases C
WHERE
C.dateOpened BETWEEN #startDate and #endDate
GROUP BY
C.protocolID
ORDER BY
total DESC
END
EXEC [dbo].[sp_CountAndGroupByProtocol] '2015-01-01', '2016-08-01'
And I get the correct result:
total protocolID
1 60 3860
2 43 5829
...
Each protocol is linked to one scientist (i.e namePI). tblProtocols:
ID protocol_ID namePI
------------------------
1 3860 1
2 5829 5
..
tblPI:
ID firstName lastName
------------------------
1 John Smith
2 Davis Emma
...
I would like to add the person's last name and first name for each protocol:
total protocolID lastName firstName
---------------------------------------------------
1 60 3860 Smith John
2 43 5829 Davis Emma
...
I know that join should work, but wherever I put "JOIN", I get
error: incorrect syntax near JOIN
Is it because I am using SQL Server?
I would greatly appreciate the community's feedback. Thank you!

Answer 1

This should be what you want, but if you post your code that is erroring out we can likely give you a precise reason for it.
SELECT COUNT(C.protocolID) AS total, c.protocolID, lastName, firstName
FROM tblCases C
INNER JOIN tblProtocols P on P.Protocol_ID = C.ProtocolID
INNER JOIN tblPI PI on PI.ID = P.NamePI
WHERE C.dateOpened BETWEEN #startDate and #endDate
GROUP BY C.protocolID, lastName, firstName
ORDER BY total desc