用PHP內部聯接3個表

Question

我正在嘗試開發一個管理系統作為我論文的一部分。

問題：以下查詢出了什么問題？

$query = "SELECT ab.bloodtype, dep.date_donated, dep.amount, sr.
        first_name, sr.last_name, loc.location_name
    FROM deposits AS dep 
    INNER JOIN donorstb AS sr ON dep.donor_id = sr.donorID 
    INNER JOIN available_blood AS ab ON dep.blood_id = ab.blood_id 
    INNER JOIN location AS loc ON dep.location_id = loc.location_id 
    ORDER BY donorID DESC;"

所需的輸出如下所示：

Firstname | Lastname |    Date Donated    | Donated at | Bloodtype | Amount

Ron       | Flores   |  November 18,2017  |   Vigan    |    B+     | 2units

Answer 1

您需要共享這些表。 無論我怎樣編輯您的代碼。 試試吧 -

$query = "SELECT sr.first_name as Firstname, sr.last_name as Lastname, dep.date_donated as 'Date Donated', loc.location_name as 'Donated at', ab.bloodtype as Bloodtype, dep.amount as Amount
FROM deposits AS dep
INNER JOIN donorstb AS sr ON dep.donor_id = sr.donorID
INNER JOIN available_blood AS ab ON dep.blood_id = ab.blood_id
INNER JOIN location AS loc ON dep.location_id = loc.location_id
ORDER BY sr.donorID DESC;"