SQL PIVOT组由2列组成

Question

我有一个出勤表，如下所示我希望按时间和部分对它们进行分组，状态为 null 表示员工缺席：

知道如何生成如下输出吗？

我目前的代码：

SELECT TIME,COUNT(SECTION) AS SECTION,COUNT(STATUS) AS COUNT 
FROM attendance_record
GROUP BY TIME,SECTION
ORDER BY TIME

Answer 1

如果我理解你的问题，只需使用条件聚合：

SELECT TIME, SECTION, COUNT(*) as TOTAL,
       COUNT(STATUS) AS IN, ( COUNT(*) - COUNT(STATUS) ) as ABSENT
FROM attendance_record
GROUP BY TIME, SECTION
ORDER BY TIME