The underlying problem is that DB2 processes recursion by essentially producing one level of recursion at a time (breadth first), while Oracle uses depth first.

在底层，DB2处理递归时采用的方法是逐层递归（广度优先），而Oracle采用的是深度优先的方法。

youdao

The underlying problem is that DB2 processes recursion by essentially producing one level of recursion at a time (breadth first), while Oracle uses depth first.

在底层，DB2处理递归时采用的方法是逐层递归（广度优先），而Oracle采用的是深度优先的方法。

youdao