oracl 和db2 常用语法比较： 1、取前N条记录 Oracle：Select * from TableName where rownum <= N; DB2：Select * from TableName fetch first N rows only; 2、取得系统日期 Oracle：Select sysdate from dual; DB2：Select current timestamp from sysibm.sysdummy1; 3、空值转换 Oracle：Select
MyBatis 目录(?)[-] mybatis实战教程mybatis in action之一开发环境搭建 mybatis实战教程mybatis in action之二以接口的方式编程 mybatis实战教程mybatis in action之三实现数据的增删改查 mybatis实战教程mybatis in action之四实现关联数据的查询 mybatis实战教程mybatis in action之五与spring3集成附源码 mybatis实战教程mybatis in action之六与S
看看下面三个关联查询的 SQL 语句有何区别？
SELECT * FROM film JOIN film_actor ON (film.film_id = film_actor.film_id)
SELECT * FROM film JOIN film_actor USING (film_id)
SELECT * FROM film, film_actor WHERE film.film_id = film_actor.film_id
最大的不同更多是语法糖，但有一些有意思的东西值得关
