SQL21

说明：  《SQL 21天自学通》这本书挺好的，菜鸟级，简单易学。在第一周我们将向大家介绍 SQL 的发展历程及其前景，并来学习第一个 SQL 语句 SELECT 语句。它使我们能够用自己的方法来从数据库中检索到自己想要的数据同时在第一周我们也将学习 SQL 的函数、联合查询及子查询 嵌于查询中的查询。并举出多个例子以帮助您理解它们，这些例子是适用于Oracle7，Sybase SQL Server，Microsoft Access，Microsoft Query，我们会用高亮显示指出它们的相似之处以及不同点，读者们会觉得这些例子更具有适用性和趣味性。
(SQL 21 days self-study pass this book is quite good, rookie level, easy to learn. In the first week we will introduce the development of SQL and its prospects, and to learn the first SQL statement SELECT statement. It enables us to retrieve the data we want our in our own way. In the first week we will also learn SQL functions, joint queries and subquery queries embedded in queries. Citing a number of examples to help you understand them, these examples are suitable for Oracle7, Sybase SQL Server, Microsoft Access, Microsoft Query, we will highlight that the similarities and differences, readers will find these examples is more applicable and more interesting)