mysql or 语句

回答: 在MySQL中，OR语句用于在WHERE子句中指定多个条件之一成立的情况。当同时有AND和OR操作符时，MySQL会优先处理AND操作符。为了明确处理顺序和消除歧义，建议使用括号来确定条件的处理顺序。例如，可以使用以下语句来查询满足条件的记录：SELECT * FROM products WHERE (products.vend_id=1002 OR products.vend_id=1003) AND prod_price >= 10; \[2\]

需要注意的是，在带有OR条件的WHERE语句中，MyISAM表可以使用索引，而InnoDB表则不行。如果你使用的是MyISAM表，可以创建一个示例表来演示，如下所示：
CREATE TABLE IF NOT EXISTS a (
id int(1) NOT NULL AUTO_INCREMENT,
uid int(11) NOT NULL,
aNum char(20) DEFAULT NULL,
PRIMARY KEY (id),
KEY uid (uid)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=6; \[3\]
#### 引用[.reference_title]
- *1* [MySQL中or语句的使用方法](https://blog.csdn.net/weixin_32165903/article/details/113305027)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
- *2* [MySQL语句之or/and](https://blog.csdn.net/haibo0668/article/details/79484846)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
- *3* [mysql or语句的优化](https://blog.csdn.net/sunyuhua_keyboard/article/details/78352932)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt"}} ] [.reference_item]
[ .reference_list ]