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Update 数据库系统原理.md

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补充 Next-Key Locks 锁定区间的示意图。
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2026-10-25 19:34:22 +08:00
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@@ -362,6 +362,8 @@ SELECT c FROM t WHERE c BETWEEN 10 and 20 FOR UPDATE;
(20, +∞)
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<div align="center"> <img src="pics/next-key-locks.png" width="560px"/> </div><br>
## 七、关系数据库设计理论
### 函数依赖