Oracle同一张表内使用In语句查询,多层嵌套如何进行优化?

[Qzcipccisv]

select * from wms_depot T where T.DEPOTID IN
(select T.DEPOTID from wms_depot T where T.DEPOTID
IN (select T.DEPOTID from wms_depot T where T.DEPOTID = 10002 OR T.DEPOTPARENTID = 10002)
OR T.DEPOTPARENTID IN (select T.DEPOTID from wms_depot T where T.DEPOTID = 10002 OR T.DEPOTPARENTID = 10002))
OR T.DEPOTPARENTID IN (select T.DEPOTID from wms_depot T where T.DEPOTID
IN (select T.DEPOTID from wms_depot T where T.DEPOTID = 10002 OR T.DEPOTPARENTID = 10002)
OR T.DEPOTPARENTID IN (select T.DEPOTID from wms_depot T where T.DEPOTID = 10002 OR T.DEPOTPARENTID = 10002))

[SSH198]

可以使用ORACLE中的集合函数进行优化。

[StriveYung]

你们谁有统计多个表的存储过程嘛 有的话借来 参考 参考我的qq980827202 谢谢了

[hudingchen]

看了半天才看明白，根据一个部门id求出它的下面所有的部门，嵌套这么层干嘛啊，汗。。 看看下面的写法是否满足你的需求：

SELECT t.*
  FROM wms_depot t
 START WITH t.DEPOTID = 10002
CONNECT BY PRIOR t.DEPOTID = t.DEPOTPARENTID

[linwaterbin]

1）通过把in换为exists，看看执行计划有无改善 2）用with子句，把in的部分先灌进临时表，再来select，如果数据量不大的话