Sql 在同一个表中运行多个计数/统计报表的最佳方法？

我正试图收集一些有关员工的统计信息。下面的查询将用于收集SELECT语句中有关特定地区特定学校的所有适用信息

我现在真正喜欢做的是能够对同一地区内的不同学校运行SELECT语句来比较一个地区内的学校，或者甚至可以相互比较地区

但是，所有数据都在一个表中。显然，我不能在查询中一个接一个地放入多个语句。我试着在他们之间加入工会，但也没用

SELECT WorkLocationName AS District, SchoolName AS School, COUNT(FileNumber) AS Records,MIN(strftime('%Y', date('now')) - BirthYear) AS MinAge,MAX(strftime('%Y', date('now')) - BirthYear) AS MaxAge,
    AVG(strftime('%Y', date('now')) - BirthYear) AS AvgAge,
    (MIN(CAST(replace(replace(TotSalary,',',''),'$','') AS REAL))) As MinSalary,
    (MAX(CAST(replace(replace(TotSalary,',',''),'$','') AS REAL))) As MaxSalary,
    (AVG(CAST(replace(replace(TotSalary,',',''),'$','') AS REAL))) As AvgSalary
FROM DPISTAFF2015_2016
WHERE CAST(replace(replace(TotSalary,',',''),'$','') AS REAL) > 0.00
    AND WorkLocationName = 'XXX Sch Dist'
    AND SchoolName = 'XXX High'

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我想知道在这一点上最好的做法是什么。我可以使用SELECT DISTINCT school Name来获取学校的唯一列表，并使用WHERE来获取某个地区唯一的学校，但我如何执行我拥有的SELECT语句，即每个学校或地区的计数记录、最大和最小年龄、最大和最小工资等？

我想您正在寻找分组依据：

您应该修复表，以便将数字存储为数字，而不是字符串

SELECT WorkLocationName, SchoolName,
       COUNT(FileNumber) AS Records,
       MIN(strftime('%Y', date('now')) - BirthYear) AS MinAge,
       MAX(strftime('%Y', date('now')) - BirthYear) AS MaxAge,
       AVG(strftime('%Y', date('now')) - BirthYear) AS AvgAge,
       MIN(CAST(replace(replace(TotSalary, ',', ''), '$', '') AS REAL)) As MinSalary,
       MAX(CAST(replace(replace(TotSalary, ',', ''), '$', '') AS REAL)) As MaxSalary,
       AVG(CAST(replace(replace(TotSalary, ',', ''), '$', '') AS REAL)) As AvgSalary
FROM DPISTAFF2015_2016
WHERE CAST(replace(replace(TotSalary, ',', ''), '$', '') AS REAL) > 0.00
GROUP BY WorkLocationName, SchoolName;