如何计算列值？

Question

这是我的疑问：

SELECT DISTINCT r1.STATE_OFFICE_CODE,
   r1.AREA_OFFICE_CODE,
   r1.AREA_OFFICE_NAME,
   r2.LAST_EOD_EXECUTION
FROM report_one r1
INNER JOIN report2 r2 ON r1.distributor_code = r2.distributor_code
ORDER BY r1.AREA_OFFICE_CODE;

工作正常。输出：  

但是，当我尝试计算r2.LAST_EOD_EXECUTION的列时，我得到的错误“不是按功能分组”：

SELECT DISTINCT r1.STATE_OFFICE_CODE,
   r1.AREA_OFFICE_CODE,
   r1.AREA_OFFICE_NAME,
   r2.LAST_EOD_EXECUTION,
   count(r2.LAST_EOD_EXECUTION) AS NumberOfDates
FROM report_one r1
INNER JOIN report2 r2 ON r1.distributor_code = r2.distributor_code
ORDER BY r1.AREA_OFFICE_CODE;

请有人帮忙吗？我如何计算价值？

Answer 1

删除distinct关键字并添加group by子句：

SELECT r1.STATE_OFFICE_CODE,
   r1.AREA_OFFICE_CODE,
   r1.AREA_OFFICE_NAME,
   r2.LAST_EOD_EXECUTION,
   count(r2.LAST_EOD_EXECUTION) AS NumberOfDates
FROM report_one r1
INNER JOIN report2 r2 ON r1.distributor_code = r2.distributor_code
GROUP BY r1.STATE_OFFICE_CODE,
   r1.AREA_OFFICE_CODE,
   r1.AREA_OFFICE_NAME,
   r2.LAST_EOD_EXECUTION
ORDER BY r1.AREA_OFFICE_CODE;

编辑：
它并不完全清楚您尝试实现的目标，但如果您尝试获取每组不同LAST_EOD_EXECUTION值的数量，则需要使用distinct中的count关键字：

SELECT r1.STATE_OFFICE_CODE,
   r1.AREA_OFFICE_CODE,
   r1.AREA_OFFICE_NAME,
   r2.LAST_EOD_EXECUTION,
   count(distinct r2.LAST_EOD_EXECUTION) AS NumberOfDates
FROM report_one r1
INNER JOIN report2 r2 ON r1.distributor_code = r2.distributor_code
GROUP BY r1.STATE_OFFICE_CODE,
   r1.AREA_OFFICE_CODE,
   r1.AREA_OFFICE_NAME,
   r2.LAST_EOD_EXECUTION
ORDER BY r1.AREA_OFFICE_CODE;