Select Sublist Quantity from Table in SQL Server - sql

Question

I am working with SQL sever table and at technical point I am stuck.
Below I am attaching a screen-shot of the table query and result also the required logic.
There are two portions of query, one is without any condition and second is with condition that select "qty" when parent_id is NULL else print 0,
I want to print the "qty" of sub-item when its qty differs from its parent's "qty"
Here is the script:
GO
CREATE TABLE [dbo].[#Temp_order](
[order_id] [int] IDENTITY(1,1) NOT NULL,
[orderdate] [datetime] NULL
) ON [PRIMARY]
GO
GO
CREATE TABLE [dbo].[#Temp_order_list](
[order_list_id] [int] IDENTITY(1,1) NOT NULL,
[order_id] [int] NOT NULL,
[qty] [int] NOT NULL,
[price] [money] NOT NULL,
[type] [int] NOT NULL,
[parent_id] [int] NULL,
CONSTRAINT [PK_Temp_order_list] PRIMARY KEY CLUSTERED
(
[order_list_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/*
*/
INSERT INTO #Temp_order
( orderdate )
VALUES ( '2015-01-16 05:08:53' -- orderdate - datetime
)
INSERT INTO #Temp_order_list
( order_id, qty, price, type, parent_id )
VALUES ( (SELECT MAX(order_id) FROM #Temp_order), -- order_id - int
1, -- qty - int
10, -- price - money
2, -- type - int
NULL -- parent_id - int
)
DECLARE #ParentID AS INTEGER
SELECT #ParentID = MAX(order_list_id) FROM #Temp_order_list
INSERT INTO #Temp_order_list
( order_id, qty, price, type, parent_id )
VALUES ( (SELECT MAX(order_id) FROM #Temp_order), -- order_id - int
1, -- qty - int
12, -- price - money
3, -- type - int
#ParentID -- parent_id - int
)
INSERT INTO #Temp_order_list
( order_id, qty, price, type, parent_id )
VALUES ( (SELECT MAX(order_id) FROM #Temp_order), -- order_id - int
4, -- qty - int
13, -- price - money
3, -- type - int
#ParentID -- parent_id - int
)
SELECT * FROM #Temp_order_list WHERE order_id = 1
SELECT #Temp_order.order_id ,#Temp_order_list.order_list_id,#Temp_order_list.price,#Temp_order_list.type,
CASE WHEN #Temp_order_list.parent_id IS NOT NULL THEN 0
ELSE
ISNULL(#Temp_order_list.qty ,'') END AS quantity
FROM #Temp_order
INNER JOIN #Temp_order_list ON #Temp_order.order_id = #Temp_order_list.order_id
WHERE #Temp_order.order_id = 1
DROP TABLE #Temp_order
DROP TABLE #Temp_order_list
Any better solution?

Answer 1

Looking at your last comment, I can suggest to add self join and check that condition :
SELECT ordr.order_id,
list.order_list_id,
list.price,
list.type,
CASE
WHEN parentlist.order_list_id IS NOT NULL THEN list.qty
WHEN list.parent_id IS NOT NULL THEN 0
ELSE ISNULL(list.qty, '')
END AS quantity
FROM #Temp_order ordr
INNER JOIN #Temp_order_list list
ON ordr.order_id = list.order_id
LEFT JOIN #Temp_order_list parentlist
ON parentlist.order_list_id = list.parent_id
AND list.qty > parentlist.qty
AND list.type = 3
WHERE ordr.order_id = 1