SQL Server存儲過程可插入所選數據

Question

我不熟悉存儲過程。 在一個過程中，我試圖從一個表中選擇數據並將該數據插入另一個表中。 例如，這是我的選擇聲明：

SELECT SUM((qty_invoiced * price)) FROM table1,table2
WHERE table1.co_num = table2.co_num 
AND UPPER(table2.strIDX) = 'S' 
AND DATEPART(wk,table1.order_date) = DATEPART(wk,Getdate()) 
AND YEAR(table1.order_date) = YEAR(Getdate()) 

然后，我想將sum字段的值插入另一個表。

我將如何使用SQL Server以最有效的方式做到這一點。 我可以用.net代碼（C＃，VB等）執行此操作，但希望通過存儲過程更有效地執行此操作

Answer 1

您可以通過多種方式執行此操作。 您是否希望查詢返回單行或多行？

如果您期望它返回單行，則最直接的方法可能是將值保存到某個變量中，如下所示...

DECLARE @mySum DECIMAL

SELECT @mySum = SUM((qty_invoiced * price)) 
FROM table1,table2
WHERE table1.co_num = table2.co_num 
AND UPPER(table2.strIDX) = 'S' 
AND DATEPART(wk,table1.order_date) = DATEPART(wk,Getdate()) 
AND YEAR(table1.order_date) = YEAR(Getdate()) 

然后可以在插入語句中使用@mySum作為要插入的值。 當然，僅當您從查詢返回單個值時，該方法才有效。

如果要一次從該查詢的結果中插入多行，則可以執行以下操作...

INSERT INTO SomeTable
( TheSumColumn )
SELECT SUM((qty_invoiced * price)) 
FROM table1,table2
WHERE table1.co_num = table2.co_num 
AND UPPER(table2.strIDX) = 'S' 
AND DATEPART(wk,table1.order_date) = DATEPART(wk,Getdate()) 
AND YEAR(table1.order_date) = YEAR(Getdate()) 

或者，您可以使用SELECT INTO子句。 有關所有這些示例，請參見 “ 使用INSERT和SELECT添加行 ”。

Answer 2

聽起來您真正需要的是視圖。

CREATE VIEW vWeeklySum
as
SELECT 
YEAR(table1.order_date) as [Year],
DATEPART(wk,table1.order_date) as [WeekNo],
SUM(qty_invoiced * price) [Total]
FROM table1
JOIN table2
ON  table1.co_num = table2.co_num 
WHERE UPPER(table2.strIDX) = 'S' 
GROUP BY YEAR(table1.order_date),
DATEPART(wk,table1.order_date)

這樣，如果您的原始數據發生更改，您的視圖將發生更改，而無需執行任何操作。 然后您可以像這樣使用它：

SELECT [Total]
FROM vWeeklySum
WHERE [Year] = 2015
AND [WeekNo] = 5

如果您仍想將其保存到表（快照）中，則存儲的過程將類似於：

CREATE PROC SaveWeek(DateTime @Date)
AS

DELETE FROM myTable
WHERE WeekNo = DATEPART(wk,@Date) 
AND [Year] = YEAR(@Date)

INSERT INTO myTable
([Year], WeekNo, [Total])
SELECT 
YEAR(@Date),
DATEPART(wk,@Date),
SUM(qty_invoiced * price)
FROM table1
JOIN table2
ON  table1.co_num = table2.co_num 
WHERE UPPER(table2.strIDX) = 'S' 
AND DATEPART(wk,table1.order_date) = DATEPART(wk,@Date) 
AND YEAR(table1.order_date) = YEAR(@Date)
GROUP BY YEAR(@Date),
DATEPART(wk,@Date)

那你可以用

DateTime @now
set @now = getdate()
exec SaveWeek @now

Answer 3

如果您想提高效率，則永遠不要對SARG字段使用函數，因此應該執行以下操作：

INSERT INTO table3
SELECT SUM((qty_invoiced * price))
FROM table1 t1,table2 t2
WHERE t1.co_num = t2.co_num 
AND t2.strIDX in ('s','S') 
AND t1.order_date >= @startdate 
AND t1.order_date < @enddate

計算語句前變量的正確值。 @enddate故意是第二天，以防萬一您的字段是日期時間。