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### 常用语言 | ||
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- `DDL` 数据定义语言 | ||
- `DCl` 数据控制语言 | ||
- `DCL` 数据控制语言 | ||
- `DML` 数据操纵语言 | ||
- `DQL` 数据查询语言 | ||
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# 数据库系统的结构 | ||
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## 数据库系统的`三级模式`结构 | ||
## 数据库系统的 `三级模式` 结构 | ||
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- 数据库系统通常采用三级模式结构 | ||
- 模式、外模式、内模式 | ||
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