分贝：
menuid Name Url Parentid Value
1 Products node NULL 0
2 Windows node NULL 0
3 Store node NULL 0
4 Download node NULL 0
5 About node NULL 0
6 Office node 1 0
7 Office 2003 # 6 1
8 Office 2007 # 6 1
9 Office 2010 # 6 1
10 Mobile node 1 0
11 IPhone # 10 1
12 Htc # 10 1
13 XP # 2 1
14 Vista # 2 1
15 Windows 7 # 2 1
16 Chrome node 4 0
查询：
"WITH temp (menuid, name, url, parentid,value ) AS "+
" ( SELECT m.menuid, m.name, m.url, m.parentid,m.value " +
" FROM menutable m "+
" where m.menuid=1 " +
" UNION ALL "+
" SELECT mt.menuid, mt.name, mt.url, mt.parentid,mt.value " +
" FROM menutable mt INNER JOIN temp t " +
" on mt.parentid=t.menuid "+
") "+
"SELECT menuid, name, url, COALESCE(parentid,0),value "+
"FROM temp "
结果：
MenuID Name ParentID Url value
1 Products 0 node 0
6 Office 0 node 0
10 Mobile 0 node 0
11 IPhone 0 # 1
12 Htc 0 # 1
7 Office 2003 0 # 1
8 Office 2007 0 # 1
9 Office 2010 0 # 1
为什么parentid总是0？我检查其他例子，但无法找到错误。谢谢... ................................. ................................ ............................... ...............................