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Update ch02: 基础查询与排序.md

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2021-08-22 11:49:12 +08:00
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ch02: 基础查询与排序.md
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@@ -503,6 +503,13 @@ INSERT INTO user(name, date_login) VALUES
![图片](./img/ch02/ch02.07_null_last2.jpg) ![图片](./img/ch02/ch02.07_null_last3.jpg)
还可以使用 `COALESCE` 函数
![图片](./img/ch02/ch02.07_null_last4.jpg)
##