Question

我想在从表中检索varchar时删除特定字符。查询如下所示：

SELECT ServiceName,
       case isNumeric(Ramusage) 
         when 1 then 
           cast ( ltrim ( rtrim ( ramusage )) as int )
         else 
           0 
       end as test,
       priority
  FROM ProcessInfo

这里的问题是ramusage是一个varchar，它存储的值为12,500K，4,321K。

这里我想从条目中删除k并单独显示数字。

Answer 1

您想使用REPLACE功能：

REPLACE(ramusage, 'k', '')

参考：

Answer 2

使用REPLACE

DECLARE @ProcessInfo TABLE(
        ServiceName VARCHAR(MAX),
        Ramusage VARCHAR(MAX),
        priority INT
)

INSERT INTO @ProcessInfo (ServiceName,Ramusage,priority)
SELECT 'TEST','12,123K',1

SELECT ServiceName,
       case isNumeric(REPLACE(REPLACE(Ramusage,'K',''),',','')) 
         when 1 then 
           cast ( ltrim ( rtrim ( REPLACE(REPLACE(Ramusage,'K',''),',',''))) as int )
         else 
           0 
       end as test,
       priority
  FROM @ProcessInfo

我们所做的是创建一个CLR函数来取一个字符串amd删除所有非数字项

[Microsoft.SqlServer.Server.SqlFunction]
    public static SqlString RemoveNonNumeric(SqlString strValue)
    {
        string strNew = strValue.ToString();

        char[] chrArray = strNew.ToCharArray();

        strNew = null;

        for (int iChar = 0; iChar < chrArray.Length; iChar++)
        {
            if (Char.IsNumber(chrArray[iChar]))
                strNew += chrArray[iChar];
        }

        // Put your code here
        return new SqlString(strNew);
    }

Answer 3

substr( ltrim( rtrim( ramusage ) ), length( ramusage ) - 1)

编辑 replace，如下面的答案所述，效果更好。

使用查询检索数据时从varchar中删除特定字符

3 个答案: