如何对字母数字列求和

Question

我有一列（附在下面），其中包含字母数字值，我需要对其所有值求和。

Percentage
----------
50.6687 percent
36.0178 percent
33.1196 percent
29.7688 percent
7.6338 percent
97.1024 percent
40.7949 percent
161.56 percent

我试过这段代码，但最后出错了

SUM(CAST(S.FIELD_PERCENTAGE AS FLOAT)) OVER() [Sum of PERCENTAGE]

错误是

Msg 8114, Level 16, State 5, Line 8
Error converting data type nvarchar to float.

我怎样才能达到这个预期的结果：

Percentage         Sum of Percentage
----------         ----------------
50.6687 percent    456.666
36.0178 percent    456.666
33.1196 percent    456.666
29.7688 percent    456.666
7.6338 percent     456.666
97.1024 percent    456.666
40.7949 percent    456.666
161.56 percent     456.666

Answer 1

50.6687 percent 不是有效数字，因此为了用它计算，请在您的 CAST

中尝试 TRIM(REPLACE(S.FIELD_PERCENTAGE, 'percent', ''))

DECLARE @t TABLE(
FIELD_PERCENTAGE varchar(50)
)

INSERT INTO @t VALUES
('50.6687 percent')
,('36.0178 percent')
,('33.1196 percent')
,('29.7688 percent')
,('7.6338 percent')
,('97.1024 percent')
,('40.7949 percent')
,('161.56 percent')

SELECT sum(cast(TRIM(REPLACE(S.FIELD_PERCENTAGE, 'percent', '')) AS FLOAT)) over() [Sum of PERCENTAGE]
  FROM @t s

Answer 2

我使用了以下组合并取得了结果。

SUM(CAST(REPLACE(S.FIELD_PERCENTAGE,'Percent','')AS FLOAT)) OVER() AS [Sum of Percentage],

如何对字母数字列求和

How to sum the alpha numeric column

sql

sql-server

tsql

sql-server-2008