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如何在SQL Server 2008 R2中將nvarchar值乘以十進制

[英]How to multiply nvarchar values to decimal in SQL Server 2008 R2

我已經寫了這段代碼

數量= 5比率= 50.10

SELECT cast(convert(decimal, qty)+ convert(decimal, rate) as decimal)
FROM product where code='P0001'

結果= 250應該是250.50

DECLARE @QTY VARCHAR(10)
DECLARE @RATE VARCHAR(10)
SET @QTY = 5 
SET @RATE = 50.10

SELECT @QTY,@RATE 

SELECT CAST(CONVERT(DECIMAL(10,2), @QTY) * CONVERT(DECIMAL(10,2), @RATE) AS DECIMAL(10,2))

更改為

SELECT cast(convert(decimal(18,2), qty)+ convert(decimal(18,2), rate) as decimal(18,2))
FROM product where code='P0001'

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