postgre case when else

在PostgreSQL中，CASE WHEN语句用于在查询中进行条件判定和返回结果。它的语法形式为：CASE WHEN condition1 THEN result1
WHEN condition2 THEN result2
...
ELSE result
END
其中，condition1、condition2等是条件表达式，result1、result2等是条件满足时返回的结果，ELSE后面的result是当所有条件都不满足时返回的默认结果。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
- *1* *3* [postgresql case when then else end的用法](https://blog.csdn.net/cchulu/article/details/103529542)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
- *2* [case when在postgresql和mysql中的区别](https://blog.csdn.net/qq_41358151/article/details/127055145)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v93^chatsearchT3_2"}}] [.reference_item style="max-width: 50%"]
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