Question

我需要计算表格中的记录，但只有当pId相同时，我才必须将值user_id 55和61视为一个。

id     pId  user_id

6126    55  127742
6128    55  127584
6132    58  128788
6134    55  54445
6136    55  127897
6139    61  127584



select id, pId, user_id, count(1),
    from table
    where date >= '2017-01-19 00:00:00' AND date < '2017-01-20 00:00:00'
    group by user_id
    ;

Answer 1

创建另一个表，其中61由55替换。现在计算您想要计算的任何内容。

select a.user_id, count(distinct a.pid_user_id)
    from (select id, 
     concat(if(pid = 61, 55, pid) , '_', user_id) as pid_user_id, 
     user_id
     from table
     where date >= '2017-01-19 00:00:00' AND date < '2017-01-20 00:00:00') as a
group by a.user_id;

如果值为GROUP_CONCAT行

1 个答案: