SQL Server table to determine whether there is a field [turn]

- For example, in Table A to judge whether there is a field C two methods:     
one,    
 the IF  EXISTS (    
  the SELECT  . 1  the FROM the SYSOBJECTS Tl    
   the INNER  the JOIN The SYSCOLUMNS T2 the ON t1.id = t2.ID    
  the WHERE t1.name = ' A '  the AND T2 .NAME = ' C '     
 )     
 the PRINT  ' presence '     
  the ELSE     
 the PRINT  ' absent '     
     
two, dapper, described classical     
the IF  COL_LENGTH ( ' A ' , 'C ' ) the IS  the NOT  NULL     
    the PRINT N ' presence '     
the ELSE     
    the PRINT N ' absent '     
    
Method a:      
SELECT    *    from    the syscolumns    WHERE    ID = object_id ( ' table ' )    and    name = ' Column name '     
Description: The presence of this column is returned a note record, return empty absent;     
    
method two:     
SELECT    COUNT ( * )    from    the sysobjects A, B the syscolumns   WHERE a.id= B.id   and   b.name = ' FLAG1 '   and a.type = ' U '    and    a.name = ' T_Pro_ProductClass '     
Description: Returns 1 is present, there is no return 0