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数据库复习——基础知识
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## markdonw绘图
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### 时序图
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```sequence
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A->B:因果关系
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B->A:返回值
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```
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### 流程图
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```flow
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st=>start: 第一步
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op=>operation: 第二步
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cond=>condition: Yes or No?
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e=>end
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st->op->cond
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cond(yes)->e
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cond(no)->op
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```
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### 右向图
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```mermaid
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graph LR
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A[第一步<br/>第二行] -->B(第二步<br/>第二行)
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B --> C{决策}
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C -->|原因1| D[结果1<br/>第二行]
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C -->|原因2| E[结果2<br/>第二行]
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```
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### 扇形图
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```mermaid
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pie
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title Pie Chart
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"原因一" : 99
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"原因二" : 666
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"原因三" : 188
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```
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