SQL 实用函数

CREATE FUNCTION [dbo].[varcharmax2table]
    (
      @value VARCHAR(MAX) ,
      @separator VARCHAR(255)
    )
RETURNS TABLE
AS
RETURN
    SELECT  LTRIM(RTRIM(b.value)) value
    FROM    ( SELECT    CONVERT(XML, ‘<v>‘ + REPLACE(@value, @separator,
                                                     ‘</v><v>‘) + ‘</v>‘) value
            ) a
            OUTER APPLY ( SELECT    N.v.value(‘.‘, ‘varchar(max)‘) value
                          FROM      a.value.nodes(‘/v‘) N ( v )
                        ) b
    WHERE   LTRIM(RTRIM(b.value)) <> ‘‘
GO

假设查询地市，传参是一字符串，如‘北京，上海，广州，深圳‘

select * from table1

where city in ( select value from MTNOH_AAA_Platform.dbo .varcharmax2table(‘北京，上海，广州，深圳‘, ‘,‘))