MySQL查詢問題與計算字段

Question

我想通過人員生成選擇客戶交易。

它應該顯示我所有回電，約會，已發送電子郵件或特定座席的其他任何狀態的計數（由ID生成）。

架構：

CREATE TABLE IF NOT EXISTS `client_transaction` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `client_id` int(11) NOT NULL,
  `generated_by_id` int(11) NOT NULL,
  `schedule_for_id` int(11) NOT NULL,
  `transaction_type` varchar(50) NOT NULL,
  `target_date_time` datetime NOT NULL,
  `date_added` datetime NOT NULL,
  PRIMARY KEY (`id`),
  KEY `client_id` (`client_id`)
)

查詢：

SELECT generated_by_id as agent_id, count(*) as call_backs
FROM client_transaction
WHERE transaction_type='CALL_BACK'
GROUP BY generated_by_id

SQL字段

我已經創建了一種狀態的查詢。 但是，每個狀態我都需要它。 我也想從其他座席表中獲取座席名稱。 獲取所有適當的數據后，如何離開代理表？

謝謝。

Answer 1

只需將transaction_type添加為查詢中的字段，然后對其進行另一級別的分組：

SELECT
    generated_by_id AS agent_id,
    transaction_type,
    count(*) AS transaction_count
FROM client_transaction
GROUP BY generated_by_id, transaction_type
/* sort in some manner */
ORDER BY generated_by_id ASC, transaction_type ASC

通過連接到代理表進行類似查詢的示例可能類似於：

SELECT
    /* I am assuming field names on agent table
     * and am guessing you want to join to be able
     * to get something like agent name in this query
    */
    a.id AS `agent_id`,
    a.name AS `agent_name`,
    ct.transaction_type AS `transaction_type`,
    count(*) AS `transaction_count`
FROM agent AS a
LEFT JOIN client_transaction AS ct
    ON a.id = ct.generated_by_id
GROUP BY `agent_id`, `transaction_type`
/* sort in some manner */
ORDER BY `agent_id` ASC, `transaction_type` ASC

Answer 2

每個狀態我都需要

按交易類型分組。

SELECT generated_by_id as agent_id, transaction_type, count(*) as call_backs
FROM client_transaction
GROUP BY generated_by_id, transaction_type

我怎樣才能離開與代理表？

與LEFT JOIN 。