单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级执行计划(for oracle)讲执行计划之前需要知道：SQL处理的基本过程主要包括：　 查询语句处理 (select)? ? DML语句处理(insert update delete) DDL 语句处理(create .. drop .

Which will be faster out of these two queries – one with OR or one with INWhere does MyISAM cache table recordsWhich will be faster out of queries with explicit INNER JOIN and implicit oneIs InnoDB