获取MMSQL数据库表信息

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.xtype=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   sys.extended_properties g   on   a.id=g.major_id   and   a.colid=g.minor_id
  left   join   sys.extended_properties f   on   d.id=f.major_id   and   f.minor_id   =0
  --where   d.name='要查询的表'
  order   by   a.id,a.colorder