Question

I have 3 tables as

products TABLE
  FIELDS: productid, catid,...

sales TABLE
  FIELDS: trackid, productid,...

promotion TABLE
  FIELDS: trackid, productid,...

Now I need something like

ProductID     CatID     TotalSales      TotalPromotion
    1           1          10                3 

How can I achieve this?

Thanks for the help

Answer 1

Try this:

SELECT a.productid, 
       a.catid, 
       a.totalsales, 
       b.totalpromotion 
FROM   (SELECT p.productid, 
               p.catid, 
               COUNT(s.productid) AS totalsales 
        FROM   products p 
               LEFT JOIN sales s 
                 ON p.productid = s.productid 
        GROUP  BY p.productid, 
                  p.catid) a 
       INNER JOIN (SELECT p.productid, 
                          p.catid, 
                          COUNT(s.productid) AS totalpromotion 
                   FROM   products p 
                          LEFT JOIN promotion s 
                            ON p.productid = s.productid 
                   GROUP  BY p.productid, 
                             p.catid) b 
         ON a.productid = b.productid