SELECT 語句內連接

Question

我想知道我是否可以對我現在擁有的三個查詢中的一個進行查詢。

 $sql     = "SELECT * 
             FROM joblist WHERE customer = :customer"; // this is a bindParam 

 $sql_val = "SELECT a.customer, SUM(a.value) AS tvalue
             FROM joblist AS a
             INNER JOIN joblist AS b
             ON a.customer = b.customer
             GROUP BY a.customer";

 $sql_bal = "SELECT *
             FROM (SELECT SUM(balance) AS tbalance 
             FROM joblist GROUP BY customer) AS total_balance
             WHERE tbalance = :tbalance";

我使用的表是客戶，下面是列。

ID - work_order - customer - description - value - balance - status - notes

我當然使用 php PDO 和 HTMl。

基本上，我有一個用於查詢公司的搜索功能。 結果已顯示，但我需要 value 和 balance 列的總計。 唯一真正有效的是從表中提取數據。 我沒有成功獲得價值和平衡的總數。

當前代碼頁

Answer 1

可能不太理解你的問題，所以我會做一些猜測：

SELECT
  t1.*,
  t2.tvalue,
  t3.tbalance
FROM
  (SELECT
    *
  FROM
    joblist
  WHERE customer = :customer) t1
  JOIN
    (SELECT
      a.customer,
      SUM(a.value) AS tvalue
    FROM
      joblist AS a
    GROUP BY a.customer) t2
    ON t1.customer = t2.customer
  JOIN
    (SELECT
      b.customer,
      SUM(b.balance) AS tbalance
    FROM
      joblist AS b
    GROUP BY b.customer
    HAVING tbalance = :tbalance) t3
    ON t3.customer = t1.customer;