Peter Brawley wrote:
> 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.
>>
>>
>>
>
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>
Thats workign great, the only problem is the WHERE clause means I only
show rows where there is sales info in the database. Sometimes there
will be no sales info in there for a particular retailer - would it be
possible to show zero for these?
