Question

我有一个表有一些字段有一个checkup_date字段（type = datetime，ex：value ='2013-11-13 14:20:30'）。我按年编写查询组

SELECT year(eh_patient_checkup.checkup_date) as 'Year', count(*)
  FROM phcdb.eh_patient_checkup eh_patient_checkup
GROUP BY year(eh_patient_checkup.checkup_date)

它显示了我的结果

Year ----- count(*)
-----------------
2011 ----- 203
2012 ----- 1007
2013 ----- 3020

但我希望每4月1日至3月31日（明年）都能参加GROUP BY。例如

Year ------------------------- count(*)
--------------------------------------
2011-04-01 to 2012-03-31 ----- 203
2012-04-01 to 2013-03-31 ----- 5656
2013-04-01 to 2014-03-31 ----- 1213

有人可以帮我改进查询吗？

Answer 1

您可以使用datediff

SELECT date_add('2013-04-01', INTERVAL YearDiff YEAR) 'from date'
, date_add('2013-04-01', INTERVAL YearDiff + 1 YEAR) 'to date'
, Amount
FROM
(
    SELECT floor(datediff(eh_patient_checkup.checkup_date,'2013-04-01') / 365) as 'YearDiff', count(*) AS 'Amount'
    FROM phcdb.eh_patient_checkup eh_patient_checkup
    GROUP BY floor(datediff(eh_patient_checkup.checkup_date,'2013-04-01') / 365)
) as temp

唯一要做的工作就是必须在选择中获得正确的年份范围。

SQL查询按给定日期范围记录的组记录

1 个答案: