我有一个返回数据库中所有可用股票的查询。一世 需要制作一个存储过程来获取用户输入的特定项目的itemCode，batchNo，数量和价格。
----------------------------------------------
| id | itemCode | batchNo | availQty | price |
----------------------------------------------
| 1 | item_1 | 07292016| 5 | 5.50 |
| 2 | item_1 | 07312016| 10 | 5.50 |
| 3 | item_1 | 08012016| 2 | 6.00 |
我的问题是，如果用户输入了6个要购买的数量，我怎样才能获得前2行结果以获得总数量为6？
结果必须是：
07292016 --- 5
07312016 --- 1
答案 0 :(得分：1)
试试这个
DECLARE @Tbl TABLE (id INT, itemCode NVARCHAR(50), batchNo NVARCHAR(50), availQty INT, price DECIMAL(5,2))
INSERT INTO @Tbl VALUES
(1, 'item_1' , '07292016', 5 , 5.50 ),
( 2 , 'item_1', '07312016' ,10, 5.50),
( 3 , 'item_1', '08012016' ,2 , 6.00 )
DECLARE @Quantity INT = 6
SELECT *
FROM
@Tbl
WHERE
id <= (
SELECT TOP 1
A.id
FROM
(
SELECT
id ,
itemCode ,
batchNo ,
availQty ,
price,
(SELECT SUM(availQty) FROM @Tbl IT WHERE IT.id <= T.id) AS TotalAmount
FROM
@Tbl T
) A
WHERE
A.TotalAmount >= @Quantity
ORDER BY A.id
)
输出：
id itemCode batchNo availQty price
1 item_1 07292016 5 5.50
2 item_1 07312016 10 5.50
已更新
SELECT
R.id ,
R.itemCode ,
R.batchNo ,
R.availQty ,
R.price ,
CASE WHEN R.MaxId = id THEN R.availQty - (TotalQuantity - @Quantity)
ELSE R.availQty END OutQuantity
FROM
(
SELECT
id ,
itemCode ,
batchNo ,
availQty ,
price,
MAX(id) OVER (ORDER BY (SELECT NULL)) MaxId,
SUM(availQty) OVER (ORDER BY (SELECT NULL)) TotalQuantity
FROM
@Tbl
WHERE
id <= (
SELECT TOP 1
A.id
FROM
(
SELECT
id ,
itemCode ,
batchNo ,
availQty ,
price,
(SELECT SUM(availQty) FROM @Tbl IT WHERE IT.id <= T.id) AS TotalAmount
FROM
@Tbl T
) A
WHERE
A.TotalAmount >= @Quantity
ORDER BY A.id
)
) R
WHERE
@Quantity > 0
输出
id itemCode batchNo availQty price OutQuantity
1 item_1 07292016 5 5.50 5
2 item_1 07312016 10 5.50 1
答案 1 :(得分：1)
我怀疑这是有效率的，而且查询很可怕，但以下内容会为您提供所需内容：
-- Create Test Data
create table #Items
(
id int not null primary key,
itemCode varchar(30) not null,
batchNumber varchar(30) not null,
availQty int not null,
price smallmoney not null
);
insert into #Items
values
(1, 'item_1', '07292016', 5, 5.50),
(2, 'item_1', '07312016', 10, 5.50),
(3, 'item_1', '08012016', 2, 6.00)
select
*
from
#Items
;
-- Set up required parameters
declare
@requiredItemCode varchar(30) = 'item_1',
@requiredQty int = 6
-- The query to get the required result
select
i.*,
case
when
@requiredQty -
isnull(
(
select
sum(availQty)
from
#Items i2
where
i2.itemCode = i.itemCode
and i2.id < i.Id
),
0) < i.availQty
then
@requiredQty -
isnull(
(
select
sum(availQty)
from
#Items i2
where
i2.itemCode = i.itemCode
and i2.id < i.Id
),
0)
else
i.availQty
end as qtyToTake
from
#Items i
where
i.ItemCode = @requiredItemCode
and
case
when
@requiredQty -
isnull(
(
select
sum(availQty)
from
#Items i2
where
i2.itemCode = i.itemCode
and i2.id < i.Id
),
0) < i.availQty
then
@requiredQty -
isnull(
(
select
sum(availQty)
from
#Items i2
where
i2.itemCode = i.itemCode
and i2.id < i.Id
),
0)
else
i.availQty
end > 0
-- Clean up test data
drop table #Items
输出：
id itemCode batchNumber availQty price
----------- -------- ----------- ----------- ---------------------
1 item_1 07292016 5 5.50
2 item_1 07312016 10 5.50
3 item_1 08012016 2 6.00
(3 row(s) affected)
id itemCode batchNumber availQty price qtyToTake
----------- -------- ----------- ----------- --------------------- -----------
1 item_1 07292016 5 5.50 5
2 item_1 07312016 10 5.50 1
(2 row(s) affected)
答案 2 :(得分：0)
我还没有测试过，但如果您有任何问题，仍然可以在此基础上进行更改。希望你想要这个
CREATE OR ALTER PROCEDURE dbo.getStock @item_Code nvarchar(30), @quantity int
AS
//Declare variables
DECLARE @id INT
DECLARE @itemCode nvarchar(30)
DECLARE @batchNo nvarchar(30)
DECLARE @qty INT
DECLARE @cumulativeQty INT
DECLARE @price DECIMAL(18,2)
//Declare cursor
DECLARE @getStock CURSOR
SET @getStock = CURSOR FOR
SELECT Id, ItemCode, batchNo, availQty, price
FROM your_table
WHERE ItemCode = @item_Code
ORDER BY batchNo ASC
//Create temp table to store all of the intermediate stock records into it
//If always make sure if its already exist just drop and recreate
IF OBJECT_ID('tempdb..#TmpStock') IS NOT NULL
BEGIN
DROP TABLE #TmpStock
END
ELSE
BEGIN
CREATE TABLE #TmpStock(Id INT, ItemCode nvarchar(30), BatchNo nvarchar(30), Quatnity INT, Price Decimal(18,2))
END
//Open the cursor
OPEN @getStudents
//Read the next row record into the cursor
FETCH NEXT
FROM @getStock INTO @id, @itmCode, @batchNo, @qty, @price
SET @cumulativeQty = 0
//Loop through one row by another which is selected above and stored in cursor
WHILE @@FETCH_STATUS = 0
BEGIN
//If the cumulative quantity is less than user's input quantity
//then keep inserting into the temp table and deduct the inserted qty
SET @cumulativeQty = @cumulativeQty + @qty
IF( @quantity <= @cumulativeQty)
INSERT INTO #TmpStock VALUES(@id, @itmCode, @batchNo, @quantity, @price );
ELSE
INSERT INTO #TmpStock VALUES(@id, @itmCode, @batchNo, @qty, @price );
@cumulativeQty= @quantity - @qty
END
FETCH NEXT
FROM @getStock INTO @id, @itmCode, @batchNo, @qty, @price
END
//Closing the cursor
CLOSE @getStock
DEALLOCATE @getStock
//Now select your data from temp table
SELECT * FROM #TmpStock