MySQL全文本搜索与“喜欢" %% [英] MySQL Full-Text search vs Like %%

问题描述

主要区别是什么?两者的用例是什么?谢谢！

What are key differences and what is a use case for both of them? Thanks!

推荐答案

全文搜索是一种基于特殊索引(显然是全文索引)的搜索.因此，您可以在使用O(lgN)进行搜索时获得它的力量.

Full-text search is the kind of search based on special sort of index (full-text, obviously). So you get the power of O(lgN) while searching using it.

like %% 总是时，导致表全扫描可能非常慢(当您有100k和更多的行时).

While like %% always causes table fullscan which can be terrible slow (when you have 100k and more rows).

我个人使用Like %%当它是一个小表(0-1000行)时，并且我确定它永远不会增长(并且重要的是，当like %%满足任务要求时).

Personally I use Like %% when it is a small table (0-1000 rows) and I'm sure that it will never grow (and, important, when like %% fits the task requirements).

注意:全文索引仅适用于myisam SE.如果您使用innodb-那么您需要查看一些第三方索引软件，例如 sphinx

Note: fulltext indexes are available only for myisam SE. If you use innodb - then you need to look at some 3rd party indexing software like sphinx

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