Dan,
/>...Total sales for ever would be a simple GROUP BY query with a
>sum on the sales - but I cant see how I am going to get this info.
>Do I need to use nested queries? /
You don't need nested queries. It's a crosstab or pivot table query. The
trick is to sum into one column per desired year, scope the sums on
month-to-date, and group by retailer, eg:
SELECT
r.name,
SUM(IF(LEFT(month_2,4)='2004',sales, '')) AS '2004 Sales',
SUM(IF(LEFT(month_2,4)='2005',sales, '')) AS '2005 Sales'
FROM tbl_retailer AS r
INNER JOIN tbl_sales AS s USING (retailerid)
WHERE SUBSTRING(month_2,6,2)<MONTH(NOW())
GROUP BY r.name;
PB
-----
Daniel Bowett wrote:
> I am unsure how to write this query, can someone help?
>
> I have two tables.
>
> One has a list of retailers (tbl_retailer):
>
> retailerid
> name
> postcode
>
> e.g.
>
> 1 Sprocket Supplies CH23 4PY
>
> The other has the sales by month for each retailer:
>
> retailerid
> month_2
> sales
>
> e.g.
>
> 1 2004-01 100
> 1 2004-02 400
> 1 2004-03 300
> 1 2004-04 200
> 1 2004-05 300
>
>
> What I need is a way to output a list of each retailer with two
> columns at the end being sales this year to date and the equivalent
> sales for the previous year.
>
> So the columns would be:
>
> name this_years_sales_to_date last_years_sales_to_date
>
> Total sales for ever would be a simple GROUP BY query with a sum on
> the sales - but I cant see how I am going to get this info. Do I need
> to use nested queries?
>
> Regards,
>
> Dan.
>
>
>
Attachment: [text/html]
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.361 / Virus Database: 267.12.5/149 - Release Date: 10/25/2005
