Create One Result set from 3 different Queries - mysql

Question

I am trying to create a result set using three queries. I have three tables an inventory table, a form order table, and a form order detail table. I need to be able to input a date range and get how many forms were ordered, how many are in current inventory, and how many were destroyed based on if they contain a destruction date. Ultimately i want a result set that shows:
InventoryId, FormDescription, Product, Ordered, Shipped, Destroyed, Total ending
What would be the best way to get that result set using these queries?
These are my three Queries
SELECT FOD.InventoryId, SUM(FOD.FormOrderAmount) as totalOrdered, FOD.FormShippedAmount FROM tblFormOrder FMO
JOIN tblFormOrderDetails FOD ON FOD.FormOrderId = FMO.FormOrderId
WHERE FMO.OrderDateTime BETWEEN '20110101' and '20120101'
AND FMO.OrderStatus IN ('S')
GROUP BY FOD.InventoryId, FOD.FormShippedAmount -- total shipped by date and inventoryid
SELECT INV.InventoryId, SUM(INV.CurrentAmount) as currentAmount, SUM(INV.OrderAmount) as OrderAmount,
(SUM(INV.OrderAmount) - SUM(INV.CurrentAmount)) as InventoryUsed
FROM tblInventory INV
where INV.CreatedOn
BETWEEN '20110101' and '20120101'
GROUP BY INV.InventoryId -- current amount based off ordered and used
select INV.InventoryId, count(*) as total
, FMO.OrderDateTime as OrderDate, Inv.FormNo, INV.FormDescription, INV.Product
from [tblinventory] INV
join tblformorderdetails FOD ON FOD.InventoryId = inv.InventoryId
join tblformorder FMO on FMO.FormOrderId = FOD.FormOrderId
where INV.DestructionDate
BETWEEN '20110101' and '20120101'
group by
FMO.OrderDateTime,
Inv.FormNo, INV.FormDescription, INV.Product, INV.InventoryId -- using count to find how many destroyed if they have a destruction date

Answer 1

If you want an inner join you can do this
SELECT *
FROM (...) AS Q1, (...) AS Q2, (...) AS Q3
WHERE Q1.InventoryID = Q2.InventoryID AND Q2.InventoryID = Q3.InventoryID
This will only give you the InventoryIDs that are in all 3 queries.
You probably don't want this you probably want all inventory IDs... so you do this.
SELECT *
FROM (SELECT DISTINCT InventoryID FROM tblFormOrderDetails
UNION ALL
SELECT DISTINCT InventoryID FROM tblInventory) I
LEFT JOIN (...) Q1 ON I.InventoryID = Q1.InventoryId
LEFT JOIN (...) Q2 ON I.InventoryID = Q2.InventoryId
LEFT JOIN (...) Q3 ON I.InventoryID = Q3.InventoryId

Answer 2

Make each query a subquery that you join together.
SELECT *
FROM (
SELECT FOD.InventoryId, SUM(FOD.FormOrderAmount) as totalOrdered, FOD.FormShippedAmount FROM tblFormOrder FMO
JOIN tblFormOrderDetails FOD ON FOD.FormOrderId = FMO.FormOrderId
WHERE FMO.OrderDateTime BETWEEN '20110101' and '20120101'
AND FMO.OrderStatus IN ('S')
GROUP BY FOD.InventoryId, FOD.FormShippedAmount -- total shipped by date and inventoryid
) AS q1
LEFT JOIN (
SELECT INV.InventoryId, SUM(INV.CurrentAmount) as currentAmount, SUM(INV.OrderAmount) as OrderAmount,
(SUM(INV.OrderAmount) - SUM(INV.CurrentAmount)) as InventoryUsed
FROM tblInventory INV
where INV.CreatedOn
BETWEEN '20110101' and '20120101'
GROUP BY INV.InventoryId -- current amount based off ordered and used
) AS q2 ON q1.InventoryId = q2.InventoryId
LEFT JOIN (
select INV.InventoryId, count(*) as total
, FMO.OrderDateTime as OrderDate, Inv.FormNo, INV.FormDescription, INV.Product
from [tblinventory] INV
join tblformorderdetails FOD ON FOD.InventoryId = inv.InventoryId
join tblformorder FMO on FMO.FormOrderId = FOD.FormOrderId
where INV.DestructionDate
BETWEEN '20110101' and '20120101'
group by
FMO.OrderDateTime,
Inv.FormNo, INV.FormDescription, INV.Product, INV.InventoryId -- using count to find how many destroyed if they have a destruction date
) AS q3 ON q1.InventoryId = q3.InventoryId