Mysql SQL中的简单数据透视表转换

我正在努力理解如何使用pivot操作符来转置一个表，但我无法理解它。任何帮助都会很好。这是我需要转换的查询

SELECT 
    sum(delayCarrier>0)  AS 'Carrier Delay',
    sum(delayWeather>0) AS 'Weather Delay',
    sum(delayTraffic>0) AS 'Air Traffic Delay',
    sum(delaySecurity>0)  AS 'Security Delay'
FROM flights

这是表格版本。

我需要它读：

'TypeOfDelay','Frequency'
-------------------------
Carrier Delay | 32093
Weather Delay | 4887
Air Traffic Delay | 40730
Security Delay | 215

---

对不起，我知道这个问题被问了很多，我看过很多，但我似乎没有任何直觉。提前感谢。

这里有一个查询，它将为您提供所需的输出，尽管我不能诚实地说它是一个支点，或者说它很漂亮

SELECT 'Carrier Delay' AS TypeOfDelay, SUM(delayCarrier > 0) AS Frequency
FROM flights
UNION ALL
SELECT 'Weather Delay' AS TypeOfDelay, SUM(delayWeather > 0) AS Frequency
FROM flights
UNION ALL
SELECT 'Air Traffic Delay' AS TypeOfDelay, SUM(delayTraffic > 0) AS Frequency
FROM flights
UNION ALL
SELECT 'Security Delay' AS TypeOfDelay, SUM(delaySecurity > 0) AS Frequency
FROM flights