如何判断表中某个字段是主键？

知道表名,如何判断表中某个字段是主键？ 问题点数：20、回复次数：2Top

1 楼Qihua_wu（小吴）回复于 2005-01-28 16:49:28 得分 5

select   count(*)   from   sysobjects   where   xtype   =   'PK'   and   parent_obj   in   (select   id   from   sysobjects   where   name=表名   and   xtype   =   'U')   and   name   =   '字段'  
   
   
  select   count(*)   from   sysobjects   where   xtype   =   'PK'   and   parent_obj   =   object_id(表名)   and   name   =   '字段'  
   
   
  count(*)   >0则该字段是，否在不是  
  Top

2 楼daijingjie2002（艰苦创业）回复于 2005-01-28 16:51:45 得分 15

SELECT    
    表名=case   when   a.colorder=1   then   d.name   else   ''   end,  
    表说明=case   when   a.colorder=1   then   isnull(f.value,'')   else   ''   end,  
    字段序号=a.colorder,  
    字段名=a.name,  
    标识=case   when   COLUMNPROPERTY(   a.id,a.name,'IsIdentity')=1   then   '√'else   ''   end,  
    主键=case   when   exists(SELECT   1   FROM   sysobjects   where   xtype='PK'   and   name   in   (  
      SELECT   name   FROM   sysindexes   WHERE   indid   in(  
        SELECT   indid   FROM   sysindexkeys   WHERE   id   =   a.id   AND   colid=a.colid  
      )))   then   '√'   else   ''   end,  
    类型=b.name,  
    占用字节数=a.length,  
    长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),  
    小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),  
    允许空=case   when   a.isnullable=1   then   '√'else   ''   end,  
    默认值=isnull(e.text,''),  
    字段说明=isnull(g.[value],'')  
  FROM   syscolumns   a  
    left   join   systypes   b   on   a.xusertype=b.xusertype  
    inner   join   sysobjects   d   on   a.id=d.id     and   d.xtype='U'   and     d.name<>'dtproperties'  
    left   join   syscomments   e   on   a.cdefault=e.id  
    left   join   sysproperties   g   on   a.id=g.id   and   a.colid=g.smallid      
    left   join   sysproperties   f   on   d.id=f.id   and   f.smallid=0  
    --where   d.name='table_name'             --如果要查询特定table,加上这句  
  order   by   a.id,a.colorderTop

相关问题

• 字段
• 表
• colorder
• columnproperty
• xtype
• colid
• 表名
• pk
• left join
• where

• 帖主：niuniu777
• Qihua_wu
• daijingjie2002

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