SQL避免根據LIKE表達

Question

我與列編號，tDate，描述，退幣，卡希銀行交易表中的多個時間相加行。我想看看我怎麼花我的錢，特別是在亞馬遜和一個叫梅佐店，所以我想這樣的結果：

Month Amazon Mazo Total 
1  100  200 300 

我嘗試這樣的：

SELECT 
    MONTH(tDate) AS Month, 
    SUM(IF(description LIKE '%amazon%',cashOut,0)) AS Amazon, 
    SUM(IF(description LIKE '%mazo%',cashOut,0)) AS Mazo, 
    SUM(cashOut) AS Total 
FROM `transactions` 
GROUP BY Month 

但是，我得到了以下：

Month Amazon Mazo Total 
1  100  300 300 

的問題與此SQL查詢是，「梅佐」 -transactions總和是錯誤的，因爲它也增加了「亞馬遜」的交易。

我想要的交易選擇，總結相互排斥或類似的東西，使每一筆交易只以上的款項之一的一部分（而不是訴諸PHP或類似）。 （我的表格包含比這更多的數據，並且我有很多搜索條件，所以使用'％mazo％'作爲搜索詞是不夠的。我需要一個通用的解決方案來解決這個問題。）

有人有建議嗎？表及其數據的

詳情：

CREATE TABLE `transactions` (
`id` bigint(20) NOT NULL AUTO_INCREMENT, 
`tDate` date NOT NULL, 
`description` varchar(200) NOT NULL, 
`cashOut` decimal(10,0) NOT NULL, 
`cashIn` decimal(10,0) NOT NULL, 
PRIMARY KEY (`id`) 
) ENGINE=InnoDB 

INSERT INTO `transactions` (`id`, `tDate`, `description`, `cashOut`, `cashIn`) VALUES 
(1, '2010-01-05', 'amazon', '100', '0'), 
(4, '2010-01-15', 'mazo', '200', '0'); 

Answer 1

您可以通過在內部查詢標記每行，然後過濾與創建互斥組：

SELECT 
    MONTH(tDate) AS Month, 
    SUM(IF(flag = 'amazon', cashOut, 0)) AS Amazon, 
    SUM(IF(flag = 'mazo', cashOut, 0)) AS Mazo, 
    SUM(IF(flag = 'other', cashOut, 0)) AS Other, 
    SUM(cashOut) AS Total 
FROM (
    SELECT tDate, cashOut, 
     CASE 
      WHEN description LIKE '%amazon%' THEN 'amazon' 
      WHEN description LIKE '%mazo%' THEN 'mazo' 
      ELSE 'other' 
     END AS flag 
    FROM transactions 
) x 
GROUP BY Month 

這樣，你永遠不會兩次計數同一個事務如果某個交易將匹配多個關鍵字。如果你不想重複兩次相同的關鍵字查詢，並可以用一個列表看起來像住：

Month What  Sum 
1  amazon 100 
2  mazo  200 

那麼你可以使用：

SELECT 
    MONTH(tDate) AS Month, 
    flag AS What, 
    SUM(cashOut) AS Total 
FROM (
    SELECT tDate, cashOut, 
     CASE 
      WHEN description LIKE '%mazo%' THEN 'mazo' 
      WHEN description LIKE '%amazon%' THEN 'amazon' 
      ELSE 'other' 
     END AS flag 
    FROM transactions 
) x 
GROUP BY Month, flag 

Answer 2

您正在搜索包含mazo字符串。如果你只是想梅佐，變化：

SUM(IF(description LIKE '%mazo%',cashOut,0)) AS Mazo, 

到

SUM(IF(description = 'mazo',cashOut,0)) AS Mazo, 

編輯：在回答您的意見，您可以使用正則表達式[[:<:]]搜索word boundaries：

SUM(IF(description REGEXP '[[:<:]]mazo[[:>:]]',cashOut,0)) AS Mazo, 

Answer 3

使用=有確切的文本，而不是like和簡單地失去了IF。試試這個：

SELECT 
    MONTH(tDate) AS Month, 
    SUM((description = 'Amazon') * cashOut) AS Amazon, 
    SUM((description = 'Mazo') * cashOut) AS Mazo, 
    SUM(cashOut) AS Total 
FROM `transactions` 
GROUP BY Month 

Answer 4

SELECT 
    MONTH(tDate) AS Month, 
    SUM(IF(description LIKE '%amazon%',cashOut,0)) AS Amazon, 
    SUM(IF(description LIKE '%mazo%' AND description NOT LIKE '%amazon%',cashOut,0)) AS Mazo, 
    SUM(cashOut) AS Total 
FROM `transactions` 
GROUP BY Month