怎么优化一下下面的SQL运行速度_Oracle开发

如何优化一下下面的SQL运行速度？
SELECT  DISTINCT  p.sID AS sID, p.SNAME AS sName, mainOrg.sFName AS sFName
FROM SA_OPPerson p JOIN SA_OPOrg mainOrg ON p.SMAINORGID = mainOrg.sID
WHERE  ( p.sID IN ('-') ) OR (p.sID IN (SELECT  pm.SPERSONID AS sPersonID
FROM SA_OPOrg org JOIN SA_OPOrg orgC ON orgC.sFID LIKE org.sFID || '%' JOIN SA_OPOrg pm ON orgC.sID = pm.sParent
WHERE  org.sID IN ('-', 'E93A43058AD540C191CEDC9B6C79E940', 'PSN01', 'A3226FBBBB864D92A5FBE925572BBA06') ))
ORDER BY mainOrg.sFName ASC, p.SNAME ASC

------解决方案--------------------

引用:

SELECT  DISTINCT  p.sID AS sID, p.SNAME AS sName, mainOrg.sFName AS sFName
FROM SA_OPPerson p JOIN SA_OPOrg mainOrg ON p.SMAINORGID = mainOrg.sID
WHERE  ( p.sID IN ('-') ) OR (p.sID IN (SELECT  pm.SPERSONID AS sPersonID
FROM SA_OPOrg org JOIN SA_OPOrg orgC ON orgC.sFID LIKE org.sFID
------解决方案--------------------
'%' JOIN SA_OPOrg pm ON orgC.sID = pm.sParent
WHERE  org.sID IN ('-', 'E93A43058AD540C191CEDC9B6C79E940', 'PSN01', 'A3226FBBBB864D92A5FBE925572BBA06') ))
ORDER BY mainOrg.sFName ASC, p.SNAME ASC

具体的优化你要提供执行计划的，如下先给你改一下，再试试，你看一下你耗时的是不是在排序上了？


SELECT p.sID AS sID, p.SNAME AS sName, mainOrg.sFName AS sFName
  FROM SA_OPPerson p
  JOIN SA_OPOrg mainOrg ON p.SMAINORGID = mainOrg.sID
 WHERE p.sID IN(SELECT pm.SPERSONID AS sPersonID
           FROM SA_OPOrg org
           JOIN SA_OPOrg orgC ON orgC.sFID LIKE org.sFID 
------解决方案--------------------
 '%'
           JOIN SA_OPOrg pm ON orgC.sID = pm.sParent
          WHERE org.sID IN ('-', 'E93A43058AD540C191CEDC9B6C79E940', 'PSN01',
                 'A3226FBBBB864D92A5FBE925572BBA06')
           union all
           select '-' sPersonID from dual)
group by p.sID, p.SNAME, mainOrg.sFName
ORDER BY mainOrg.sFName ASC, p.SNAME ASC

------解决方案--------------------
1 distinct 和order by 是很消耗资源的，你看看能不能从业务上把这两个去掉？
2 把or语句去掉，中间用union all连接两个结果集
3 第二个语句中，将表与表关联的方法把in去掉