使用Sql查询进行正则表达式

Question

  

选择a。[PREMISES]，a。[Class] FROM [Legacy]。[dbo]。[MyTables] as a;

以上查询返回：

您能告诉我如何从查询列210,中删除211,和a.[Class]吗？

注意：我刚刚举了一个例子。我需要一个通用的解决方案，它将适用于a.[Class]列的所有行。

注2： Class列的格式如下所示。numeric然后,之后的string。我需要先删除2部分。只需保留string部分。

Answer 1

你不一定需要在这里使用正则表达式。您可以尝试使用REPLACE：

SELECT  a.[PREMISES],
        REPLACE(REPLACE(a.[Class],'210, ',''),'211, ','') as [Class] 
FROM [Legacy].[dbo].[MyTables] as a;

要在第一个,之前删除所有内容：

SELECT  a.[PREMISES],
        LTRIM(RIGHT(NULLIF(a.[Class],''),LEN(a.[Class])-CHARINDEX(',',a.[Class]))) as [Class]
FROM [Legacy].[dbo].[MyTables] as a;

此查询，针对该数据

PREMISES            Class
Victoria Ln         210, Single Family (no style specified)
West 10th Street    211, Ranch, Single Family
East 2nd Street     Single Family

会给你这个输出：

PREMISES            Class
Victoria Ln         Single Family (no style specified)
West 10th Street    Ranch, Single Family
East 2nd Street     Single Family

Answer 2

您可以使用以下查询从,开始返回结果。

SELECT  a.[PREMISES],
        SUBSTRING(a.[Class], CHARINDEX(',',a.[Class]) + 1, LEN(a.[Class])) as [Class] 
FROM [Legacy].[dbo].[MyTables] as a;

Answer 3

只需从字符串中删除所有数字字符。

SELECT a.[PREMISES],
    SUBSTRING(a[Class], PATINDEX('%[a-z]%', a.[Class]), LEN(a.[Class])) 
  FROM [Legacy].[dbo].[MyTables] a

Answer 4

试试这个：

CREATE FUNCTION Fun_Refiner ( @val VARCHAR(MAX) )
RETURNS VARCHAR(MAX)
AS
BEGIN
    WHILE 1 = 1
        BEGIN
            IF PATINDEX('[0-9]%', @val) > 0 OR SUBSTRING(@val, 1, 1) = ','
                SET @val = RTRIM(LTRIM(REPLACE(@val,SUBSTRING(@val,PATINDEX('[0-9,]%',@val), 1), '')));
            ELSE
                BREAK;
        END;
      RETURN @val
END;

就这样称呼它：

SELECT a.[Class], dbo.Fun_Refiner(a.[Class]) FROM YourTable AS a