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select 语句内部执行顺序 #12

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astak16 opened this issue Jan 8, 2022 · 0 comments
Open

select 语句内部执行顺序 #12

astak16 opened this issue Jan 8, 2022 · 0 comments

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@astak16
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astak16 commented Jan 8, 2022

一条完整的 select 语句执行顺序：

  1. from 子句组装数据（包括 on 连接）
  2. where 子句进行条件筛选
  3. group by 分组
  4. 使用聚集函数进行计算
  5. having 筛选分组
  6. 计算所有的表达式
  7. select 的字段
  8. order by 排序
  9. limit 筛选
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@astak16