oracle start with connect by prior 遞迴查詢

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Oracle中的select語句可以用start with...connect by prior子句實現遞迴查詢，connect by 是結構化查詢中用到的，

其基本文法是：

select ... from <TableName>
where <Conditional-1>
start with <Conditional-2>
connect by <Conditional-3>;

<Conditional-1>：過濾條件，用於對返回的所有記錄進行過濾;
<Conditional-2>：查詢結果重起始根結點的限定條件;
<Conditional-3>：串連條件;

select dept_id ,dept_name,parent_id,stutas ,remark,level as levfrom pub_depart_info  where  stutas=1start with pub_depart_info.dept_id=‘1001‘connect by prior pub_depart_info.dept_id = pub_depart_info.parent_idorder by pub_depart_info.dept_id

其中：level為關鍵字，用於顯示遞迴的層書