Question

我有一个包含两列的数据库 - result和time

我试图计算特定月份中每个result存在多少行。结果success和failure

只有两个选项

我已经设法计算每个月有多少行，但我无法获得有多少success和多少failure的个人数量每个月都有。

这就是我所拥有的：

SELECT result, MONTH(time) MONTH, COUNT(*) COUNT
FROM mytable
WHERE YEAR(time)=2017
GROUP BY MONTH(time);

我正在寻找一个能让我在特定月份获得12次成功和8次失败的结果。

任何帮助将不胜感激。

Answer 1

使用条件聚合

SELECT result, MONTH(time) MONTH, 
       sum(result = 'success') as success_count,
       sum(result = 'failure') as failure_count
FROM mytable
WHERE YEAR(time) = 2017
GROUP BY result, MONTH(time);

Answer 2

我会使用以下查询：

SELECT,
    DATE_FORMAT(time, '%m %Y') AS month_year,
    SUM(CASE WHEN result = 'success' THEN 1 ELSE 0 END) AS success_count,
    SUM(CASE WHEN result = 'failure' THEN 1 ELSE 0 END) AS failure_count
FROM mytable
WHERE YEAR(time) = 2017
GROUP BY
    DATE_FORMAT(time, '%m %Y')

请注意，您应该仅按时间段进行汇总，而不是result汇总，而CASE则是<link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.css"> <script src="https://code.jquery.com/jquery-1.11.3.min.js"></script> <script src="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.min.js"></script> <body> <div data-role="page"> <div data-role="header"> <h1>Marqeta Volume Calculator</h1> </div> <div data-role="main" class="ui-content"> <label for="points">Monthly Transactions per Card</label> <input type="range" name="trx" id="trx" value="25" min="1" max="175" onchange="volumeCalc()"/> <label for="points">Monthly Active Cards</label> <input type="range" name="cards" id="cards" value="350" min="1" max="1000" onchange="volumeCalc()"/> <label for="points">Average Transaction Amount ($)</label> <input type="range" name="amt" id="amt" value="12" min="1" max="1000" onchange="volumeCalc()"/> <input type="submit" name="submit" id="submit" value="Submit" onclick="volumeCalc()"/> <label for="points">Predicted Volume ($)</label> <input type="number" name="total" id="total" readonly=true> <div id="totVolume1"></div> </div> </div> </body>表达式中和的一部分。

如何使用mysql按月和按列查询行？

2 个答案: