Daniel Bowett wrote:
> 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?
Yes. Change the INNER JOIN to a LEFT JOIN.
Michael
