Sql query correct syntax - sql

Question

I'm trying to return in a reporting service, the count of ID and NUM, that have the USERID AND CREATION_DATE entered by the user.
My aim is to get one row as a result, containing both counts. I'm getting the count correct however I'm being displayed with several rows as
a return. (which are the rows that have the parameters specified by the user). How can I get only one row containing only the fields COUNTID and COUNTNUM.
I'm using Microsoft sql server.
SELECT
(SELECT COUNT(ID)
FROM PART
WHERE USERID = $P{userId} and CREATION_DATE = $P{creationDate}) as COUNTID ,
(SELECT COUNT(NUM)
FROM IDENTITY
WHERE USERID = $P{userId} and CREATION_DATE = $P{creationDate}) as COUNTNUM
FROM
PART,
IDENTITY

Answer 1

If you only want to return one row, and each of your subqueries is returning the "count" you want, you could just remove the FROM clause from the outer query. Something like this:
SELECT ( SELECT COUNT(p.ID)
FROM PART p
WHERE p.USERID = $P{userId}
AND p.CREATION_DATE = $P{creationDate}
) AS COUNTID
, ( SELECT COUNT(i.NUM)
FROM IDENTITY i
WHERE i.USERID = $P{userId}
AND i.CREATION_DATE = $P{creationDate}
) AS COUNTNUM
Personally, I'd write the query a little differently. I'd use the subqueries as inline views cross joined in the FROM clause, with each of the inline views returning a single row. Like this:
SELECT cp.countid
, ci.countnum
FROM ( SELECT COUNT(p.ID) AS countid
FROM PART p
WHERE p.USERID = $P{userId}
AND p.CREATION_DATE = $P{creationDate}
) cp
CROSS
JOIN ( SELECT COUNT(i.NUM) AS countnum
FROM IDENTITY i
WHERE i.USERID = $P{userId}
AND i.CREATION_DATE = $P{creationDate}
) ci

Answer 2

Use a join and a Group By -- like this:
SELECT P.USERID, P.CREATION_DATE, COUNT(P.ID) AS COUNTID, COUNT(I.NUM) AS COUNTNUM
FROM PART P
JOIN IDENTITY I ON P.USERID = I.USERID AND P.CREATION_DATE = I.CREATION_DATE
WHERE P.USERID = $P{userId} and P.CREATION_DATE = $P{creationDate}
GROUP BY P.USERID, P.CREATION_DATE
As a side bonus if you take out the WHERE you can see the results for all users and all dates.
Note, if not all users and dates are in the PART table or Identity table do this:
SELECT B.USERID, B.CREATION_DATE, COUNT(P.ID) AS COUNTID, COUNT(I.NUM) AS COUNTNUM
FROM (
SELECT DISTINCT USERID, CREATEION_DATE FROM PART
UNION
SELECT DISTINCT USERID, CREATEION_DATE FROM IDENTITY
) AS B
LEFT JOIN PART P ON B.USERID = P.USERID AND B.CREATION_DATE = P.CREATION_DATE
LEFT JOIN IDENTITY I ON B.USERID = I.USERID AND B.CREATION_DATE = I.CREATION_DATE
WHERE B.USERID = $P{userId} and B.CREATION_DATE = $P{creationDate}
GROUP BY B.USERID, B.CREATION_DATE
NOTE: This second query is much more correct, but might not be needed depending on your data. Since you don't tell us anything about your data or data model it is hard for me to know if the first query will work.