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Update 数据库系统原理.md #1026

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@rogerszy rogerszy commented Dec 8, 2020

Next-key Locks 应该是前开后闭的区间，所以示例中最后的 (20, +∞)，应该修改为 (20, +supremum]，因为 +∞ 是开区间，应该设置一个不存在的最大值 supremum 代表闭区间。
@rogerszy
Update 数据库系统原理.md
9184b43 
Next-key Locks 应该是前开后闭的区间，所以示例中最后的 (20, +∞)，应该修改为 (20, +supremum]，因为 +∞ 是开区间，应该设置一个不存在的最大值 supremum 代表闭区间。
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