SQL RIGHT JOIN 关键字
SQL INNER JOIN 关键字
SQL OUTER JOIN 外部连接
SQL Join 这在下一页 ; 简单介绍 ; 多表查询
SQL FULL JOIN 关键字
SQL self join 自连接
SQL LEFT JOIN 关键字
Rails will use a JOIN SQL statement or a strategy in which multiple queries are performed.
Rails将使用一个JOIN sql语句或一个执行多个查询的策略。
Listing 9 contains the same three-way join SQL statement that was used in Listing 1 to introduce the concept of access paths and query execution.
清单9包含相同的三路联接sql语句，其用在清单1上以介绍访问路径和查询执行的概念。
Remember that this matches each CD with each artist, producing the equivalent with a SQL join.
记住，这样将匹配每张 CD 和每位艺术家，从而得到相当于 SQL 连接的效果。
应用推荐