SQL SERVER

查看所有表名：

select name from sysobjects where type='U'

查询表的所有字段名：

Select name from syscolumns Where ID=OBJECT_ID('表名')

select * from information_schema.tables

select * from information_schema.views

select * from information_schema.columns

查询所有触发器：

SELECT * FROM Sysobjects WHERE xtype = 'TR'

查看当前库中所有的触发器和与之相对应的表：

SELECT tb2.name AS tableName,tb1.name AS triggerName FROM Sysobjects tb1 JOIN Sysobjects tb2 ON tb1.parent_obj=tb2.id WHERE tb1.type='TR'

ACCESS

查看所有表名：

select name from MSysObjects where type=1 and flags=0

MSysObjects是系统对象，默认情况是隐藏的。通过工具、选项、视图、显示、系统对象可以使之显示出来。

Oracle

select cname from col where tname='ZW_YINGYEZ'

select column_name from user_tab_columns where table_name='ZW_YINGYEZ'

查询表字段数

select count(column_name) from user_tab_columns where table_name='表名';