sql和access数据库常用语句，亲测都正确，在数据库编程时必不可少的，新手也可以使用，里面教程较详细。-SQL database access and common statement, pro-test, essential database programming novice can use, which a more detailed tutorial.

sql server 数据库的高级查询教程，适合多重查询，分类查询-Advanced Search Tutorial sql server database for multiple queries, classification query

数据库系统教程第三版课后答案（施伯乐），里面是这本书所有章节的课后答案，有很多SQL程序-After-school tutorial third edition answer system (Shi Bole), which is all the chapters of this book after-school answer, there are many SQL procedures