UNION query problem

hi i have this question on the go:

http://www.experts-exchange.com/Programming/Languages/SQL_Syntax/Q_22474564.html

but i'm stuck, and have spent the last 2 days trying to get this query to work, i'm close but i'm not there.

i need to link 4 tables:

Suppliers
Deliveries (all deliveries made by a supplier)
Complaints (all complaints raised against supplier)
Periods

i want to output a query showing a by month summary of supplier performance

looking like:
Month         Deliveries      OnTime      AvgLeadTime       Complaints
Jan2007          86                 80                  12.1                     2
Feb2007           0                   0                                               0
Mar2007          10                  10                   8.0                     0

now this needs to be generated for all suppliers regardless of whether we had delivieries or not, i.e a LEFT JOIN on tSuppliers
and i need to UNION ALL the tDeliveries and tComplaints
and then do a BETWEEN on the Period table

if that makes any sense! its 8pm here and i'm weary of this!

please help

i'm using:

SELECT l.sAcc, tP.Period, Sum(l.Deliveries) AS SumOfDeliveries, Sum(l.[On Time]) AS [SumOfOn Time], Sum(l.LeadTime) AS SumOfLeadTime, Sum(l.Complaints) AS SumOfComplaints
FROM [SELECT qDel.sAcc, Format([DueDate],"yyyy-mm") AS Period
, Count(qDel.Prod) AS [Deliveries]
, Sum(qDel.OnTime) AS [On Time]
, Avg(qDel.LeadTime) AS [LeadTime]
, 0 as Complaints
FROM qDel
GROUP BY qDel.sAcc, Format([DueDate],"yyyy-mm")
UNION ALL
SELECT tblSC_Report.Account, Format([Date],"yyyy-mm") AS Period, 0 , 0 , 0, Count(tblSC_Report.ComplaintNo)
FROM tblSC_Report
GROUP BY tblSC_Report.Account, Format([Date],"yyyy-mm")
]. AS l, tP
WHERE (((l.Period) Between [tp].[pfrm] And [tp].[pto]))
GROUP BY l.sAcc, tP.Period
ORDER BY l.sAcc, tP.Period;

see the other post, for examples of what worked and didnt.

Thanks G

i'm using Access 2003 and my experience (nor brain power!) is that high
GrahamLawsAsked:
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LowfatspreadCommented:
is all you are now missing is month where there where no activity?

if so then you need a calendar table added to your query...

set up a table to contain all periods that are of interest to you ...

e.g.
reportperiod
periodDescription  char(7)  
Year smallint
month smallint
primary key (year,month)


then add it to your query as ...



 
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