[英]A PHP MySQL query regarding Joins
我有一個新手PHP MySQL問題,我有2個表,成員和消息。
表'成員'
+-----------+------+
| MEMBER_ID | NAME |
+-----------+------+
| 1 | Bob |
| 2 | Ted |
| 3 | Tom |
+-----------+------+
表'消息'
+----+------------+--------------+--------------------+
| ID | SENDERS_ID | RECEIVERS_ID | MESSAGE |
+----+------------+--------------+--------------------+
| 1 | 1 | 3 | Hello Tom from Bob |
| 2 | 2 | 3 | Hello Tom from Ted |
| 3 | 2 | 1 | Hello Bob from Ted |
+----+------------+--------------+--------------------+
我想進行一個查詢,其中Tom只有他的members.member_id可用,可以獲得他的所有消息以及發件人的姓名,如下所示:
+------+--------------------+
| name | message |
+------+--------------------+
| Bob | Hello Tom from Bob |
| Ted | Hello Tom from Ted |
+------+--------------------+
我已經閱讀了一些連接的例子,但是知道如何將它們實現到MySQL語句中。
我可以輕松獲得Tom的member_id,但不知道如何繼續進行。 我還想在數組中返回結果。
public function getMessages($member_id) {
$result = mysql_query("SELECT member_id FROM members WHERE member_id = '$member_id'") or die(mysql_error());
$no_of_rows = mysql_num_rows($result);
if ($no_of_rows > 0) {
$result = mysql_fetch_array($result);
$receivers_id = $result['member_id'];
.
// What can I do here to get the $result that I want?
.
}
$no_of_rows = mysql_num_rows($result);
if ($no_of_rows > 0) {
$results = array();
while(list($results) = mysql_fetch_array($result)) {
array_push($results, $result);
}
return $results;
}
}
任何幫助將不勝感激,
謝謝
SELECT c.name,
b.message
FROM members a
INNER JOIN messages b
ON a.member_ID = b.receivers_id
INNER JOIN members c
ON b.senders_ID = c.member_ID
WHERE a.name = 'Tom'
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