select * from sysdatabases order by name

1. 查詢資料庫中所有表
   

   select * from sysobjects where xtype='U';
   xtype='U' 表示所有使用者表
   select * from sysobjects where xtype='S';
   xtype='S' 表示所有系統表

2. 查詢指定表所有欄位名
   

   select name from syscolumns where id=Object_Id('Bod_Tag)';

3. 使用者所屬資料庫角色
   

       use yourdb  
       go  
       
    
   select DbRole = g.name, MemberName = u.name, MemberSID = u.sid  
       from sys.database_principals u, sys.database_principals g, sys.database_role_members m  
       where g.principal_id = m.role_principal_id  
       and u.principal_id = m.member_principal_id  
       order by 1, 2  
       go  

4. 登陸帳戶所屬伺服器角色
   

   use master  
   go  
    
   select SrvRole = g.name, MemberName = u.name, MemberSID = u.sid  
   from sys.server_principals u, sys.server_principals g, sys.server_role_members m  
   where g.principal_id = m.role_principal_id  
   and u.principal_id = m.member_principal_id  
   order by 1, 2  
   go 

5. 查詢所有使用者表
   

   select name from Bod..sysobjects where
    
    xtype='u' order by name