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docs: update querywrapper.md
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@ -104,7 +104,7 @@ FROM tb_account AS a, tb_article AS b
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WHERE a.id = b.account_id
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WHERE a.id = b.account_id
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```
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```
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## select function
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## select function(SQL 函数)
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```java
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```java
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QueryWrapper query=new QueryWrapper()
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QueryWrapper query=new QueryWrapper()
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@ -123,6 +123,22 @@ SELECT id, user_name, MAX(birthday), AVG(sex) AS sex_avg
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FROM tb_account
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FROM tb_account
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```
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```
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目前,MyBatis-Flex 内置的函数支持如下:
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- count
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- max
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- min
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- avg
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- sum
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- year
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- month
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- day
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- convert
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更多的函数,用户可以参考 [QueryMethods](https://gitee.com/mybatis-flex/mybatis-flex/blob/main/mybatis-flex-core/src/main/java/com/mybatisflex/core/query/QueryMethods.java)
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,然后再自己的项目里进行自定义扩展。
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## select case...when
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## select case...when
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**示例 1:**
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**示例 1:**
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