oracle+level

我猜测您可能是在询问关于 Oracle 数据库中的“Level”功能，这是一种递归查询的功能。通过 Level，您可以在一个查询中递归地访问数据，直到满足特定的条件。

举个例子，如果您有一个包含员工和其直接上级的表格，您可以使用 Level 功能查询每个员工的所有上级。以下是一个示例查询：

SELECT employee.name, manager.name, LEVEL
FROM employee
JOIN employee manager ON employee.manager_id = manager.id
START WITH employee.name = 'John'
CONNECT BY PRIOR manager.id = employee.id;

这个查询将返回 John 的所有上级，以及每个上级所处的级别（Level）。请注意，这是一个递归查询，直到没有更多的上级为止。

希望这能解答您的问题。如果我的猜测不正确，请告诉我更多信息，我会尽力帮助您！

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