oracle递归查询\sqlserver递归

使用 start with a= ‘起始ID‘ connect by prior a= b

a为子项，b为父项。

select F_CA_CODE,F_CA_PARENTCODE,LEVEL from RGT_UNIT start with F_CA_CODE = ‘0‘ connect by prior F_CA_CODE = F_CA_PARENTCODE 

查询结果：

其中LEVEL为oracle内置函数

如果加入查询条件需要在start with前面加入：

select F_CA_CODE,F_CA_PARENTCODE,LEVEL from RGT_UNIT where LEVEL=3 start with F_CA_CODE = ‘0‘ connect by prior F_CA_CODE = F_CA_PARENTCODE 

查询结果：

http://www.cnblogs.com/no27/p/4221650.html

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http://www.cnblogs.com/xfrog/archive/2010/10/10/1847462.html