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')
根据字段，查字段所在的表，注意要大写
select * from INFORMATION_SCHEMA.COLUMNS where COLUMN_NAME = 'smpl_id'
select * from INFORMATION_SCHEMA.TABLES
select * from INFORMATION_SCHEMA.VIEWS
select * from INFORMATION_SCHEMA.COLUMNS