＃1054 - 'where子句'中的未知列'XXXX'

Question

如何在子查詢中引用父查詢列？這裏是我的查詢

SELECT 
    c.username, c.staff_of, CONCAT(c.first_name, ' ', c.middle_name, ' ', c.last_name) AS csr, 
    d.date, d.account, d.total_transaction, d.total_participate, d.total_amount, 
    (SELECT COUNT(id) FROM users WHERE created_by = c.username) AS total_agents 
FROM `users` c, 
    (SELECT 
      DATE(res_date) AS date, B.res_account AS account, 
      COUNT(B.res_id) AS total_transaction, 
      COUNT(DISTINCT(B.res_account)) AS total_participate, 
      SUM(B.res_amount) AS total_amount 
    FROM 
      merchant_responses B 
    WHERE B.res_account IN (SELECT t.staff_of FROM users t WHERE t.created_by = c.username) 
    ) AS d 
WHERE c.account_type ='DSO' GROUP BY c.username 

，這是結果我得到

#1054 - Unknown column 'c.username' in 'where clause' 

我如何c.username可見的子查詢？

Thanx in advance

Answer 1

爲什麼使用子表？您使用聚合函數SUM但沒有GROUP BY語句，我想你可以這樣寫這樣的

SELECT c.username, 
      c.staff_of, 
      CONCAT(c.first_name, ' ', c.middle_name, ' ', c.last_name) AS csr, 
      DATE(B.res_date) AS date, 
      B.res_account AS account, 
      COUNT(B.res_id) AS total_transaction, 
      COUNT(DISTINCT(B.res_account)) AS total_participate, 
      SUM(B.res_amount) AS total_amount, 
      (SELECT COUNT(id) FROM users WHERE created_by = c.username) AS total_agents 
    FROM `users` c, merchant_responses B 
    WHERE B.res_account IN (SELECT t.staff_of FROM users t WHERE t.created_by = c.username) 
    AND c.account_type ='DSO' 
    GROUP BY c.username 

A C和B丟失之間的連接，我無法添加，因爲我不知道鑰匙

Answer 2

這不是子查詢它是派生表。

SELECT 
    c.username, c.staff_of, CONCAT(c.first_name, ' ', c.middle_name, ' ', c.last_name) AS csr, 
    d.date, d.account, d.total_transaction, d.total_participate, d.total_amount, 
    (SELECT COUNT(id) FROM users WHERE created_by = c.username) AS total_agents 
FROM `users` c, 
    (SELECT 
      DATE(res_date) AS date, B.res_account AS account, 
      COUNT(B.res_id) AS total_transaction, 
      COUNT(DISTINCT(B.res_account)) AS total_participate, 
      SUM(B.res_amount) AS total_amount 
    FROM 
      merchant_responses B 
    WHERE B.res_account IN (SELECT t.staff_of FROM users t) 
    ) AS d 
WHERE c.account_type ='DSO' AND d.account = c.staff_of GROUP BY c.username 

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