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Crear un disparador para múltiples operaciones

No importa, lo tengo:

Create trigger [dbo].[TR_AUDIT_TESTAUDIT]
    ON [dbo].[testaudit]
    AFTER INSERT, UPDATE, DELETE 
    AS 
BEGIN
    SET NOCOUNT ON;
    declare @action nvarchar(1) 

    set @action = 'I' -- always I 

    if exists(select top 1 1 from deleted) and not exists(select top 1 1 from inserted)         
    set @action = 'D' 

    if exists(select top 1 1 from deleted) and  exists(select top 1 1 from inserted)        
    set @action = 'U'        
END