获取最近4周的记录，按星期分组

Question

我需要一个查询，这将允许我从MySQL表中选择最后4周的数据值，但输出为从4周前的星期一开始的日期，无论当前的星期。

数据库有一个用户表，一个具有用户ID的FK的活动表。 的activityStats与FK表activityID

查询将被用来创建一个类似于数组：

$array = [ 
    "userid" => "userid", 
    "dateAdded" => "dateAdded", 
    "week1" => $array = [ 
     "monday" => $array = [ 
     "activityid" => "1", 
     "time" => "21", 
     ... 
     ] 
     "tuesday" => $array = [ 
     "activityid" => "2", 
     "time" => "16", 
     ... 
     ] 
     "wednesday" => $array = [ 
     "activityid" => "3", 
     "time" => "16", 
     ... 
     ] 
     ... 
    "week2" => $array = [ 
     "monday" => $array = [ 
     "activityid" => "8", 
     "time" => "21", 
     ... 
     ] 
     "tuesday" => $array = [ 
     "activityid" => "9", 
     "time" => "16", 
     ... 
     ] 
     "wednesday" => $array = [ 
     "activityid" => "10", 
     "time" => "16", 
     ... 
     ] 
     ... 
    ] 
    ... 
]; 

我可以创建多个查询其会做的伎俩，但有可能会得到一个要求10周或52周，单独的查询可能不会削减它。

不知道从哪里开始。

Answer 1

假设你的时间戳列被称为timestamp，您可以：

SELECT CONCAT(YEAR(timestamp), '/', WEEK(timestamp)) AS week

，然后检索特定范围，以便按周等