Question

我是新來的PHP + MySQL的編程

我想用絲束約束一下子SELCET數據，

的cons1是

Tid=user02 and Fid=user01 

和cons2是

Tid=user01 and Fid=user02 

我想輸出的數據是這樣的：

$result1 = mysql_query("SELECT * FROM myTable WHERE Tid='user02' AND Fid='user01'); 

+

$result2 = mysql_query("SELECT * FROM myTable WHERE Tid='user01' AND Fid='user02'); 

=我想要什麼

可以在單行做什麼？

或可使該存儲$ RESULT1和$ RESULT2

感謝您抽出時間閱讀我的問題的結果

Answer 1

可以OR導致單個查詢的兩個條件：

SELECT * FROM chat 
    WHERE (Tid='user02' AND Fid='user01') 
     OR (Tid='user01' AND Fid='user02') 

Answer 2

$result1 = mysql_query("SELECT * FROM chat WHERE Tid='user02' AND Fid='user01' OR Tid='user01' AND Fid='user02'"); 

部分閱讀：boolean algebra和mysql doc

Answer 3

試試這個：

$result1 = mysql_query("SELECT * FROM chat WHERE Tid='user02' AND Fid='user01' 
         UNION SELECT * FROM chat WHERE Tid='user01' AND Fid='user02'");