MySQL MySQL中的“ADD KEY”和“ADD INDEX”有什么区别?
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时间:2020-08-31 21:16:10 来源:igfitidea点击:
What is the difference between "ADD KEY" and "ADD INDEX" in MySQL?
提问by Bejkrools
I dump database and i have one question. What does this query?
我转储数据库,我有一个问题。这个查询是什么?
ALTER TABLE `ps_cart_rule` ADD KEY `id_customer` (`id_customer`,`active`,`date_to`);
ALTER TABLE `ps_cart_rule` ADD KEY `id_customer_2` (`id_customer`,`active`,`highlight`,`date_to`);
What is diffrence between ADD KEYand ADD INDEX?
ADD KEY和ADD INDEX 有什么区别?
回答by kav
KEY
is a synonym for INDEX
.
KEY
是 的同义词INDEX
。
... | ADD {INDEX|KEY} [index_name] ...
... | 添加 {INDEX|KEY} [index_name] ...
Check the MySQL documentation for ALTER TABLE.
检查ALTER TABLE的 MySQL 文档。