無法將varchar轉換為在SQL中浮動

Question

這是我的兩張桌子

CREATE TABLE [dbo].[dailyRate](
[SYMBOL] [varchar](50) NULL,
[SERIES] [varchar](50) NULL,
[OPENPRICE] [varchar](50) NULL,
[HIGHPRICE] [varchar](50) NULL,
[LOWPRICE] [varchar](50) NULL,
[CLOSEPRICE] [varchar](50) NULL,
[LASTPRICE] [varchar](50) NULL,
[PREVCLOSE] [varchar](50) NULL,
[TOTTRDQTY] [varchar](50) NULL,
[TOTTRDVAL] [varchar](50) NULL,
[TIMESTAMPDAY] [varchar](50) NULL,
[TOTALTRADES] [varchar](50) NULL,
[ISIN] [varchar](50) NULL
)


CREATE TABLE [dbo].[cmpDailyRate](
[ID] [bigint] IDENTITY(1,1) NOT NULL,
[SYMBOL] [varchar](50) NULL,
[SERIES] [varchar](50) NULL,
[OPENPRICE] [decimal](18, 4) NULL,
[HIGHPRICE] [decimal](18, 4) NULL,
[LOWPRICE] [decimal](18, 4) NULL,
[CLOSEPRICE] [decimal](18, 4) NULL,
[LASTPRICE] [decimal](18, 4) NULL,
[PREVCLOSE] [decimal](18, 4) NULL,
[TOTTRDQTY] [bigint] NULL,
[TOTTRDVAL] [decimal](18, 4) NULL,
[TIMESTAMPDAY] [smalldatetime] NULL,
[TOTALTRADES] [bigint] NULL,
[ISIN] [varchar](50) NULL,
[M_Avg] [decimal](18, 4) NULL
) 

這是我的插入查詢，用於使用強制轉換從表中獲取數據到另一個

收合| 復制代碼

INSERT into [Stock].[dbo].[cmpDailyRate]
SELECT [SYMBOL],[SERIES],Str([OPENPRICE], 18,4),Str([HIGHPRICE],18,4),
Str([LOWPRICE],18,4),Str([CLOSEPRICE],18,4),Str([LASTPRICE],18,4),Str([PREVCLOSE],18,4),convert(bigint,[TOTTRDQTY]),Str([TOTTRDVAL],18,4),
convert(date, [TIMESTAMPDAY], 105),convert(bigint,[TOTALTRADES]),[ISIN],null
FROM [Stock].[dbo].[DailyRate]

此查詢在SQL Server 2005中可以完美運行，但會在SQL Server 2008中引起錯誤（上述查詢在安裝后也在SQL Server 2008中運行；最近幾天出現錯誤）

錯誤：

錯誤無法將varchar轉換為float

該怎么辦？

Answer 1

行之一在進行浮點轉換（Str）的列中包含無效數據。 請使用以下策略來確定：

SELECT *
FROM [dailyRate]
WHERE IsNumeric([OPENPRICE]) = 0
OR IsNumeric([HIGHPRICE]) = 0

等等等

Answer 2

如果您不想過濾掉數據，則CASE語句可能更適合您。

SELECT CASE 
        WHEN IsNumeric([OPENPRICE]) = 1 THEN [OPENPRICE]
        ELSE NULL -- or 0 or whatever
       END AS OPENPRICE,
       CASE 
        WHEN IsNumeric([HIGHPRICE]) = 1 THEN [HIGHPRICE]
        ELSE NULL -- or 0 or whatever
       END AS [HIGHPRICE]
FROM [dailyRate]