SQL PIVOT 按 2 列分组

Question

我有一个如下的考勤表，我想按时间和部门对它们进行分组，状态为 null 表示该员工缺勤：

知道如何生成如下所示的输出吗？

我当前的代码：

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

Answer 1

如果我理解您的问题，请使用条件聚合：

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