oracle的start with connect by语句
2014-01-08 20:04
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这条语句可以用来实现树形的查询
基本语法是
start with 起始条件 connect by prior 连接条件
假如说有这么一张表 table(id,pid),id表示编号,pid表示上级编号
![](http://img.blog.csdn.net/20140108192931812?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc25haWxhbmdlcg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
如果要查询id=1这条记录的所有下级记录,sql为:
select * from table start with id=1 connect by prior id = pid;
![](http://img.blog.csdn.net/20140108195917875?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc25haWxhbmdlcg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
如果要查它的所有上级则为:
select * from table start with id=1 connect by prior pid = id;
或者
select * from table start with id=1 connect by id = prior pid;
![](http://img.blog.csdn.net/20140108200027828?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc25haWxhbmdlcg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
其中,prior放在哪个前面表示哪个是根节点,prior id=pid可以简单理解为:所有pid等于id的记录,反之亦然,如果要过滤记录,则可以在前面加上where语句
比如查询id=1这条记录的所有下级记录,但不包括本身:
select * from table where id<>1 start with id=1 connect by prior id = pid;
![](http://img.blog.csdn.net/20140108200403218?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvc25haWxhbmdlcg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast)
以上纯属个人理解
基本语法是
start with 起始条件 connect by prior 连接条件
假如说有这么一张表 table(id,pid),id表示编号,pid表示上级编号
如果要查询id=1这条记录的所有下级记录,sql为:
select * from table start with id=1 connect by prior id = pid;
如果要查它的所有上级则为:
select * from table start with id=1 connect by prior pid = id;
或者
select * from table start with id=1 connect by id = prior pid;
其中,prior放在哪个前面表示哪个是根节点,prior id=pid可以简单理解为:所有pid等于id的记录,反之亦然,如果要过滤记录,则可以在前面加上where语句
比如查询id=1这条记录的所有下级记录,但不包括本身:
select * from table where id<>1 start with id=1 connect by prior id = pid;
以上纯属个人理解
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