sql語句查詢的格式如下year(a.time),mouth(a.time),day(a.time)將日期分隔爲年月日
在一定的條件下分組查詢數據並統計數目
1、根據年份統計group by year(a.time)
2、根據月份統計group by year(a.time),mouth(a.time)
3、根據某一天的日誌分組查詢group by year(a.time),mouth(a.time),day(a.time)
sql的例子如下
select year(a.time),mouth(a.time),day(a.time),a.name from user a where a.name='李四' group by group by year(a.time),mouth(a.time),day(a.time)
另一種方法是根據截取函數截取長度來進行分組查詢
2020-01-01 01:01:01
substr(time,1,10)結果爲2020-01-01
group by substr(time,1,10),就是根據每天的日期來統計數目,具體要哪種類型的數據就截取幾位日期,然後group by
自己摸索總結出來的,不喜勿噴。😊