--要使用.Net写的自定义聚合函数,需以上代码开启clr功能 IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[FunTrim]') AND type in (N'FN', N'IF', N'TF', N'FS', N'FT')) DROP FUNCTION [dbo].[FunTrim] GO IF EXISTS (SELECT * FROM sys.objects WHERE object_id = OBJECT_ID(N'[dbo].[AggregateString]') AND type = N'AF') DROP AGGREGATE [dbo].[AggregateString] GO IF EXISTS (SELECT * FROM sys.assemblies asms WHERE asms.name = N'LYFZCLR') DROP ASSEMBLY [LYFZCLR] GO CREATE ASSEMBLY [LYFZCLR] AUTHORIZATION [dbo] FROM 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WITH PERMISSION_SET = SAFE; GO CREATE AGGREGATE [dbo].[AggregateString] (@FieldValue [nvarchar](4000)) RETURNS [nvarchar](4000) EXTERNAL NAME [LYFZCLR].[AggregateString]; GO CREATE FUNCTION [dbo].[FunTrim] (@FieldValue [nvarchar](4000),@trimChar [nvarchar](4000)) RETURNS [nvarchar](4000) AS EXTERNAL NAME [LYFZCLR].[UserDefinedFunctions].[FunTrim]; GO