sql - min of 9 weeks max of 15 weeks average of 16 weeks

Question

This is what I desire for my query

• average for 16 wks
• min 9 wks
• max 15 wks
• increasing month NOT alphabetic

An

Answer 1

Consider a join of two crosstab queries.

CrossTab1 Query (specify the column order in PIVOT clause)

TRANSFORM SUM(Detail.Quantity)
SELECT Detail.ItemCode
FROM Detail INNER JOIN Header ON Detail.SalesOrderNo = Header.SalesOrderNo
WHERE Header.OrderDate>=dateadd("m",-4,Date())
GROUP BY Detail.ItemCode
PIVOT MonthName(Month([Header.OrderDate]))
  IN ('November', 'December', 'January', 'February');

UnionAggQ Query (save as separate query)

Next crosstab needs another query as the source, specifically a union query of aggregates by ItemCode with categorical Metric column:

SELECT Detail.ItemCode,
       'AVG 16 WEEKS' AS Metric,
       AVG(Detail.Quantity) AS AggDetailQty
FROM Detail INNER JOIN Header ON Detail.SalesOrderNo = Header.SalesOrderNo
WHERE Header.OrderDate >= DATEADD("ww",-16, Date())
GROUP BY Detail.ItemCode

UNION ALL

SELECT Detail.ItemCode,
       'MIN 9 WEEKS' AS Metric,
       MIN(Detail.Quantity) AS AggDetailQty 
FROM Detail INNER JOIN Header ON Detail.SalesOrderNo = Header.SalesOrderNo
WHERE Header.OrderDate >= DATEADD("ww",-9, Date())
GROUP BY Detail.ItemCode

UNION ALL

SELECT Detail.ItemCode,
       'MAX 15 WEEKS' AS Metric,
       MAX(Detail.Quantity) AS AggDetailQty
FROM Detail INNER JOIN Header ON Detail.SalesOrderNo = Header.SalesOrderNo
WHERE Header.OrderDate >= DATEADD("ww",-15, Date())
GROUP BY Detail.ItemCode

Crosstab2 Query

TRANSFORM SUM(q.AggDetailQty)
SELECT q.ItemCode
FROM UnionAggQuery q
GROUP BY q.ItemCode
PIVOT q.Type IN ('AVG 16 WEEKS', 'MIN 9 WEEKS', 'MAX 15 WEEKS');

Final Query (joining both crosstabs)

SELECT t1.*, t2.*
FROM CrossTab1 t1 
INNER JOIN CrossTab2 t2
ON t1.ItemCode = t2.ItemCode