我有一個表包含一些像這樣的數據。這是問題/答案腳本的示例。 ID是自動增量,如果PID = 0,那麼它是問題,當回答任何問題時,PID被設置爲問題的ID。沒有答覆的主題。Mysql從2行中選擇記錄
ID PID SUBJECT CONTENT DATE
1 0 First Question This is my first 09/01/2013
2 0 Second Question This is second 09/01/2013
3 1 Yes this is first 09/01/2013
4 2 I agree this is second 10/01/2013
5 0 Third Question This is third question 11/01/2013
6 1 Reply to first 11/01/2013
7 1 Another reply to first 12/01/2013
8 5 This is reply of 5th 13/01/2013
9 2 Last try for second 14/01/2013
我的問題是,
我如何選擇與回答的問題算不算?
Ex.
First Question (3)
Second Question (2)
Third Question (1)
我該如何選擇今天回答的問題或答案?
Ex. For 09/01/2013
First Question (2) ---> 1 question and 1 answer but 2 actions
Second Question (1) ---> just 1 question
@Seyhan檢查編輯和演示!享受 –
謝謝@raheel shan – Seyhan