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修改多音字 #463

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Merged
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Sep 5, 2019
Merged

修改多音字 #463

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2 changes: 1 addition & 1 deletion docs/database/一千行MySQL命令.md
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Expand Up @@ -363,7 +363,7 @@ set(val1, val2, val3...)
字段不能再分，就满足第一范式。
-- 2NF, 第二范式
满足第一范式的前提下，不能出现部分依赖。
消除符合主键就可以避免部分依赖。增加单列关键字。
消除复合主键就可以避免部分依赖。增加单列关键字。
-- 3NF, 第三范式
满足第二范式的前提下，不能出现传递依赖。
某个字段依赖于主键，而有其他字段依赖于该字段。这就是传递依赖。
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