oracle之connect by的用法

connect by 用於存在父子，祖孫，上下級等層級關係的數據表進行層級查詢。 　　語法格式: 　　　　{ CONNECT BY [ NOCYCLE ] condition [AND condition]... [ START WITH condition ] 　　　　| START WITH condition CONNECT BY [ NOCYCLE ] condition [AND con

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