DB2利用syscat.references递归查出他的所有关联表
找出所有的父表：With reftables(reftabname,PRIORITY) as(
Select reftabname,1 from syscat.references as refx where refx.tabname='PROJECT'
union all
Select ref2.reftabname,reftables.PRIORITY+1 from reftables,syscat.references ref2 where reftables.reftabname=ref2.tabname
)
Select * from reftables ORDER BY PRIORITY DESC;
找出所有的子表
With reftables(tabname,PRIORITY) as(
Select tabname,1 from syscat.references as refx where refx.reftabname='PROJECT'
union all
Select ref2.tabname,reftables.PRIORITY+1 from reftables,syscat.references ref2 where reftables.tabname=ref2.reftabname andreftables.PRIORITY<2
)
Select distinct * from reftables ORDER BY PRIORITY DESC;
其中reftables.PRIORITY<2是用来控制层数，子表找到第几层！
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