主键=case when exists(SELECT 1 FROM '+@dbname1+'..sysobjects where xtype=''PK'' and name in (
  SELECT name FROM '+@dbname1+'..sysindexes WHERE indid in(
   SELECT indid FROM '+@dbname1+'..sysindexkeys WHERE id = a.id AND colid=a.colid
  ))) then 1 else 0 end,

如何取主键字段名称及字段类型

--得到主键字段名

1:
SELECT TABLE_NAME,COLUMN_NAME FROM INFORMATION_SCHEMA.KEY_COLUMN_USAGE 
WHERE TABLE_NAME<>'dtproperties'

2:
EXEC sp_pkeys @table_name='表名'

3:
select o.name as 表名,c.name as 字段名,k.colid as 字段序号,k.keyno as 索引顺序,t.name as 类型
from sysindexes i
join sysindexkeys k on i.id = k.id and i.indid = k.indid
join sysobjects o on i.id = o.id
join syscolumns c on i.id=c.id and k.colid = c.colid
join systypes t on c.xusertype=t.xusertype
where o.xtype = 'U' and o.name='要查询的表名'
and exists(select 1 from sysobjects where xtype = 'PK' and parent_obj=i.id and name = i.name)
order by o.name,k.colid

------解决方案--------------------
zjcxc的这个脚本的确有点问题，这个问题以前有朋友提过。那个帖子的地址是：
http://topic.csdn.net/u/20070625/10/490e3182-9c15-4a42-bf5e-6c99cafda258.html
其中有一处判断不太严谨，修改了一下，请zjcxc指正：

SQL code
SELECT CASE WHEN a.colorder = 1 THEN d.name ELSE '' END AS 表名, 
      CASE WHEN a.colorder = 1 THEN isnull(CONVERT(nvarchar, f.value), '') 
      ELSE '' END AS 表说明, a.colorder AS 字段序号, a.name AS 字段名, 
      CASE WHEN COLUMNPROPERTY(a.id, a.name, 'IsIdentity') 
      = 1 THEN '√' ELSE '' END AS 标识, CASE WHEN EXISTS
          (SELECT 1
         FROM sysobjects
         WHERE [color=#FF0000]parent_obj = object_id('MyTab') and    /*！！！只增加此行！！！*/[/color]
                  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 AS 主键, b.name AS 类型, a.length AS 占用字节数, 
      ......

------解决方案--------------------
确实有楼上的问题
SQL code

WHERE parent_obj = object_id(d .name) AND xtype = 'PK' AND name IN