2
一些基本的懷疑,我有:mysql表(MyISAM)中的索引如何工作?
1. Is primary key column automatically indexed?
2. What should be criteria to select index column?
3. When should I club multiple columns?
4. Does MyISAM or InnoDB has any affect on which columns should be indexed? Probably not.
5. Are they really required, specially in case if primary key column is automatically indexed?
感謝。
@Shrapnel:這是否意味着我應該索引所有這些經常在選擇查詢中使用這些列? – understack 2010-03-31 08:22:39
編輯問題4更清楚。 – understack 2010-03-31 08:24:59
@understack不那麼容易。查看答案更新。 – 2010-03-31 08:28:14