How to apply WHERE clause to multiple SELECT statements in SQL Server - sql

Question

I am creating an query that selects data from multiple tables. I have completed all the query but now I have to apply the WHERE clause to the whole query.
I have 9 select statements, and these are working fine. Data is being selected from different tables. Now I want to declare date session and I want all data to be filtered according to the date provided. I am using the below query:
SELECT
(SELECT COUNT(DISTINCT OrderItems.ProductID)
FROM OrderItems) AS 'TotalSoldItemsDistinct',
(SELECT COUNT(OrderItems.ProductID)
FROM OrderItems) AS 'TotalSoldItemsInDistinct',
(SELECT COUNT(Orders.OrderID)
FROM Orders) AS 'TotalOrders',
(SELECT COUNT(Orders.OrderID)
FROM Orders
WHERE Orders.OrderStatusID = #CompleteOStatusID) AS 'CompleteOrders',
(SELECT COUNT(Orders.OrderID)
FROM Orders
WHERE Orders.OrderStatusID = #PendingOStatusID) AS 'PendingOrders',
(SELECT COUNT(Orders.ClientID)
FROM Orders
WHERE Orders.ClientID != #WalkingCustID) AS 'namedcustomers',
(SELECT COUNT(Orders.ClientID)
FROM Orders
WHERE Orders.ClientID = #WalkingCustID) AS 'WalkingCustomers',
(SELECT SUM(OrderItems.PurchasePrice)
FROM OrderItems) AS 'TotalPurchasePrice',
(SELECT SUM(OrderItems.SalePrice)
FROM OrderItems) AS 'TotalSalePrice'
I am selecting data from 2 tables named 'Orders' and 'OrderItems', I have column TransactionDate in 'Orders' table and column OrderDate in OrderItems table on that I want to use where filter. Can anybody please suggest how to apply filter to whole query?

Answer 1

You could try this
;with tempOrderItems AS
(
SELECT
COUNT(DISTINCT OrderItems.ProductID) AS 'TotalSoldItemsDistinct',
COUNT(OrderItems.ProductID) AS 'TotalSoldItemsInDistinct',
SUM(OrderItems.PurchasePrice) AS 'TotalPurchasePrice',
SUM(OrderItems.SalePrice) AS 'TotalSalePrice'
FROM OrderItems ori
WHERE OrderDate BETWEEN xxx AND yyy
)
, tempOrders AS
(
SELECT
COUNT(o.OrderID) AS 'TotalOrders',
SUM(CASE WHEN o.OrderStatusID = #CompleteOStatusID THEN 1 ELSE 0 END) AS 'CompleteOrders',
SUM(CASE WHEN o.OrderStatusID = #PendingOStatusID THEN 1 ELSE 0 END) AS 'PendingOrders',
SUM(CASE WHEN o.ClientID != #WalkingCustID THEN 1 ELSE 0 END) AS 'namedcustomers',
SUM(CASE WHEN o.ClientID = #WalkingCustID THEN 1 ELSE 0 END) AS 'WalkingCustomers'
FROM Orders o
WHERE TransactionDate BETWEEN xxx AND yyy
)
SELECT * FROM tempOrderItems
CROSS JOIN tempOrders

Answer 2

It is not fully clear what you want as a result, but here 2 approaches.
Try the following for selecting data from 2 tables at the same time (replace the date with your criteria):
SELECT * FROM Orders AS o INNER JOIN OrderItems AS i WHERE o.TransactionDate = '2015-02-12' AND i.OrderDate = '2015-02-12';
The SELECT * selects all columns from both tables as a result and the WHERE ... AND ...-clause filters for results only with your defined date.
Try the following for selecting order item data only for Data that matches the date on a specific order.
SELECT i.* FROM Orders AS o INNER JOIN OrderItems AS i WHERE o.TransactionDate = i.OrderDate AND o.OrderID = '12345';
The SELECT i.* tells the query to only return the columns of the OrderItems. And the WHERE o.TransactionDate = i.OrderDate ensures that only order items from the same date of the order with the OrderID "12345" are returned (which is defined with the AND o.OrderID = '12345'. This would work given you have a field "OrderID" on your Order table and you want to use it as a criteria.