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From: =?UTF-8?q?=E9=99=88=E6=A2=A6=E6=A2=A6?= <3195337478@qq.com>
Date: Wed, 18 Oct 2023 04:52:10 +0000
Subject: [PATCH] =?UTF-8?q?=E9=99=88=E6=A2=A6=E6=A2=A6=E7=9A=84=E4=BD=9C?=
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Signed-off-by: 陈梦梦 <3195337478@qq.com>
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 .../20231018.md"                                 | 16 ++++++++++++++++
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diff --git "a/01 \351\231\210\346\242\246\346\242\246/20231018.md" "b/01 \351\231\210\346\242\246\346\242\246/20231018.md"
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+```mysql
+窗口大小
+riws 启用窗口大小
+between ... and ... 区间范围
+unbounded preceding 起始行   n preceding 当前行开始 往前n行
+current row 当前行           n following 从当前开始往后n行
+例：rows between unbounded preceding and current row
+这句就是起始行到尽头 
+```
+
+```mysql
+datediff n (a,b) 返回天数差 a-b
+timestampdif (单位,a,b) 可返回年差 月差 天差 时差 分差 秒差等b-a
+date_format()函数 时间输出格式
+```
+
-- 
Gitee