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logseq-1/journals/2024_06_20.md

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- 数据库三大范式 #card #java
card-last-interval:: 4.14
card-repeats:: 1
card-ease-factor:: 2.6
card-next-schedule:: 2024-06-24T05:07:31.387Z
card-last-reviewed:: 2024-06-20T02:07:31.387Z
card-last-score:: 5
- 每一列都是不可再分割的
logseq.order-list-type:: number
- 每列属性都是与主键相关的,完全依赖于主键
logseq.order-list-type:: number
- 每列属性都是与主键直接相关,非间接相关
logseq.order-list-type:: number
- drop delete和truncate #card #java
- drop是删除某个表格
- delete是删除数据主键自增不会改变
- truncate清清空数据同时清除主键自增序列
- 执行速度drop > truncate > delete