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if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[f_convert]') and xtype in (N'FN', N'IF', N'TF'))
drop function [dbo].[f_convert]
GO
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select dbo.f_convert(@s1,0),dbo.f_convert(@s1,1)
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CREATE FUNCTION f_Convert(
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