ORACLE中如何将 2017-01-15到2017-06-14,拆分成月变成2017-01-15 - 2017-01-312017-02-01 - 2017-02-282017-03-01 - 2017-03-312017-04-01 - 2017-04-302017-05-01 - 2017-05-312017-06-01 - 2017-06-14这样
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