oracle数据库 case when

在Oracle数据库中，CASE WHEN语句用于在查询或存储过程中根据条件进行条件判断并返回相应的结果。根据提供的引用内容，如果在CASE WHEN语句中省略了ELSE子句，并且存在不满足任何条件的情况，那么默认情况下将返回NULL值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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