--1：獲取當前數據庫中的所有用戶表

select Name from sysobjects where xtype='u' and status>=0 

--2：獲取某一個表的所有字段

select * from syscolumns where id=object_id('test1') 

--3：查看與某一個表相關的視圖、存儲過程、函數

select a.* from sysobjects a, syscomments b where a.id = b.id and b.text like '%表名%' 

--4：查看當前數據庫中所有存儲過程

select name as 存儲過程名稱 from sysobjects where xtype='P' 

--5：查詢用戶創建的所有數據庫

select * from master..sysdatabases D where sid not in(select sid from master..syslogins where name='sa') 或者

select dbid, name AS DB_NAME from master..sysdatabases where sid <> 0x01

--6：查詢某一個表的字段、數據類型和字段長度

select column_name,data_type ,character_octet_length from information_schema.columns where table_name = 'test1' 

select column_name,data_type ,character_octet_length from information_schema.columns where table_name = 'test2'