0
我需要一個3級菜單樹(不限制)固定3級菜單樹
的tablename = LEVEL1
+-------------+----------------------+
| level1_id | name |
+-------------+----------------------+
| 1 | AIR CONDITIONER |
| 2 | TV |
+-------------+----------------------+
的tablename = LEVEL2
+-------------+----------------------+-----------+
| level2_id | name | level1_id |
+-------------+----------------------+-----------+
| 1 | SPLIT TYPE | 1 |
| 2 | WINDOWS TYPE | 1 |
| 3 | LCD | 2 |
| 4 | PLASMA | 2 |
| 5 | MUSIC PLAYER | NULL |
+-------------+----------------------+-----------+
的tablename = LEVEL3
+-------------+----------------------+-----------+
| level3_id | name | level2_id |
+-------------+----------------------+-----------+
| 1 | AC 0.75 TON | 1 |
| 2 | AC 1 TON | 1 |
| 3 | WT 0.75 TON | 2 |
| 4 | WT 1 TON | 2 |
| 5 | LCD 32" UP | 3 |
| 6 | LCD 42" UP | 3 |
| 7 | PLASMA 32" UP | 4 |
| 8 | PLASMA 42" UP | 4 |
| 9 | CD PLAYERS | 5 |
| 10 | MP3 PLAYERS | 5 |
| 11 | CDS | NULL |
| 12 | BOOKS | NULL |
+-------------+----------------------+-----------+
是否有可能犯罪gle mysqli查詢獲得以下結果? 爲了讓我確切知道每個分類所屬的級別?
+------------------+----------------+-----------------+
| LEVEL1 | LEVEL2 | LEVEL3 |
+------------------+----------------+-----------------+
| AIR CONDITIONER | SPLIT TYPE | AC 0.75 TON |
| AIR CONDITIONER | SPLIT TYPE | AC 1 TON |
| AIR CONDITIONER | WINDOWS TYPE | WT 0.75 TON |
| AIR CONDITIONER | WINDOWS TYPE | WT 1 TON |
| TV | LCD | LCD 32" UP |
| TV | LCD | LCD 42" UP |
| TV | PLASMA | PLASMA 32" UP |
| TV | PLASMA | PLASMA 42" UP |
| NULL | MUSIC PLAYER | CD PLAYERS |
| NULL | MUSIC PLAYER | MP3 PLAYERS |
| NULL | NULL | CDS |
| NULL | NULL | BOOKS |
+------------------+----------------+-----------------+
有點貪婪。有人可以幫我這個問題,以及其中列出所有的名稱/ ID其中,當你提出表Level3的是主表和總會有一些數據父ID爲NULL
+------------------+------------+------+
| name | tablename | id |
+------------------+------------+------+
| AIR CONDITIONER | LEVEL1 | 1 |
| TV | LEVEL1 | 2 |
| MUSIC PLAYER | LEVEL2 | 5 |
| CDS | LEVEL3 | 11 |
| BOOKS | LEVEL3 | 12 |
+------------------+------------+------+
這很好。 你能幫我解決我添加到問題的頂層菜單嗎?許多Thx –
對不起,我不在線只是看到你的問題。在哪種語言,Html,C#,PHP,因爲我可以幫助HTML C#? –
嗯,我可以用php腳本(重複查詢)自己做,只是想知道是否可以通過使用單個mysql查詢來實現,而不是因爲這會更有效。我修改了我的問題,並添加了預期的查詢結果:) –