Question

I have two queries with subqueries for dateparts which I like to join.

SELECT  DateMonth, DateYear, Datestring,
    MAX(CouponTotalCount) NoOfCouponsViewed
FROM    (
        SELECT  *, DATEPART(MONTH, DateInsert) DateMonth, DATEPART(YEAR, DateInsert) DateYear, 
        CONVERT(CHAR(4), DateInsert, 100) + CONVERT(CHAR(4), DateInsert, 120) Datestring
        FROM FlurryCouponViewed
    ) sub
where couponID=249
GROUP BY DateMonth, DateYear, Datestring

SELECT  DateMonth, DateYear, Datestring,
    MAX(CouponTotalCount) NoOfCouponsRedeemed
FROM    (
        SELECT  *, DATEPART(MONTH, DateInsert) DateMonth, DATEPART(YEAR, DateInsert) DateYear, 
        CONVERT(CHAR(4), DateInsert, 100) + CONVERT(CHAR(4), DateInsert, 120) Datestring
        FROM FlurryCouponRedeemed
    ) sub

where couponID=249
GROUP BY DateMonth, DateYear, Datestring

The output is of the two queries is:

DateMonth   DateYear    Datestring NoOfCouponsViewed
----------- ----------- ---------- -----------------
2           2012        Feb 2012   5
3           2012        Mar 2012   12
4           2012        Apr 2012   25
5           2012        May 2012   25



DateMonth   DateYear    Datestring NoOfCouponsRedeemed
----------- ----------- ---------- -------------------
2           2012        Feb 2012   3
3           2012        Mar 2012   4
4           2012        Apr 2012   5
5           2012        May 2012   11

What I like to achive is two have one joined query giving me:

DateMonth   DateYear    Datestring NoOfCouponsViewed NoOfCouponsRedeemed
----------- ----------- ---------- ----------------- -------------------
2           2012        Feb 2012   5                 3
3           2012        Mar 2012   12                4
4           2012        Apr 2012   25                5
5           2012        May 2012   25                11

How can I do this ?

Answer 1

Make a inner join between the two queries and it should work:

SELECT  sub.DateMonth, sub.DateYear, sub.Datestring,
    MAX(sub.CouponTotalCount) NoOfCouponsViewed,
    MAX(sub2.CouponTotalCount) NoOfCouponsViewed
FROM    (
        SELECT  *, DATEPART(MONTH, DateInsert) DateMonth, DATEPART(YEAR, DateInsert) DateYear, 
        CONVERT(CHAR(4), DateInsert, 100) + CONVERT(CHAR(4), DateInsert, 120) Datestring
        FROM FlurryCouponViewed
    ) sub
INNER JOIN
    (   SELECT  *, DATEPART(MONTH, DateInsert) DateMonth, DATEPART(YEAR, DateInsert) DateYear, 
        CONVERT(CHAR(4), DateInsert, 100) + CONVERT(CHAR(4), DateInsert, 120) Datestring
        FROM FlurryCouponRedeemed
    ) sub2 on sub.DateMonth = sub2.DateMonth and sub.DateYear = sub2.DateYear and sub.Datestring = sub2.Datestring
where sub.couponID=249 and sub2.couponID=249
GROUP BY sub.DateMonth, sub.DateYear, sub.Datestring