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修复错别字

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liushaohui1 2022-06-21 19:19:22 +08:00 committed by 安然
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@ -24,7 +24,7 @@
![整体流程](https://raw.githubusercontent.com/qiurunze123/imageall/master/mysql1.png)
ID列：数据为一组数字表示执行select语句的顺序
id值相同的时候执行顺数由上至下
id值相同的时候执行顺序由上至下
id值越大优先级越高，越先被执行
ID列中的如果数据为一组数字，表示执行SELECT语句的顺序；如果为NULL，则说明这一行数据是由另外两个SQL语句进行 UNION操作后产生的结果集