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