查询表名为tb_menu的所有列名
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1 select name from syscolumns where id=object_id('tb_menu')

　　查询表名为tb_menu的所有列名个数

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1 select count(name) from syscolumns where id=object_id('tb_menu')

　　或者

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1 2 3 select count(syscolumns.name) from   syscolumns ,sysobjects    where  syscolumns.id=sysobjects.id  and sysobjects.name = 'tb_menu'