如何正確創建聯系人頁面？

Question

我想做一個聯系頁面。 這是我的表結構：

Accounts Table: 

1) id
2) User_id
3) Full_name
4) Username
5) Email
6) Password

Contacts Table: 

1) My_id (This is the user who added friend_id)
2) Contact_id (this is the contact who was added by my_id)
3) Status

我的查詢看起來像這樣：

$sid = ID of user who is viewing;

$sql = "SELECT STRAIGHT_JOIN DISTINCT contacts.contact_id, 
accounts.full_name FROM contacts INNER JOIN accounts
on contacts.contact_id = accounts.user_id WHERE 
contacts.my_id = '$sid' OR contacts.contact_id = '$sid'"; 

問題是它不能以正確的方式工作。 我最終在查詢中看到了我的名字（意思是當我登錄時，我在聯系人中看到我的名字而不是聯系人名稱）。

如何解決這個問題？ 謝謝。

Answer 1

這里不需要STRAIGHT_JOIN關鍵字。 要獲取聯系信息，請使用第二個JOIN到contacts表，該contacts表將其與帳戶相關聯。

SELECT
  DISTINCT c.contact_id,
  cn.full_name
FROM 
  accounts a
  /* first join connects the adding user's id to records in contacts */
  INNER JOIN contacts c ON a.user_id = c.My_id
  /* second join connects contact list user ids back to names in accounts */
  INNER JOIN accounts cn ON cn.user_id = c.Contact_id
WHERE a.User_id = '$sid'

Answer 2

這個查詢應該足夠了：

SELECT DISTINCT contacts.contact_id, accounts.full_name
FROM contacts, accounts
WHERE (contacts.my_id = '$sid' AND contacts.contact_id = accounts.user_id)
OR (contacts.contact_id = '$sid' AND contacts.my_id = accounts.user_id)