Mysql计算错误

Question

我修复了最后一个问题，但现在还有一些其他问题:我以这种格式编辑了我的查询。但是，我仍然有 1 个大问题 - PU_1day 和 PU_7day 计算不正确:每行中附加“1”(当 true 为 2 时为 3，当 true 为 0 时为 1)。我该如何解决这个问题？ :(

SELECT u.date, 
       u.des_channel, 
       u.des_type, 
       u.country,
       count(distinct(u.id)) as Reg_n, 
       sum(if((u.date=bp.date)*(u.id=bp.user_id),bp.o_outcome,0)) as P_$,
       sum(if((u.date=bp.date)*(u.id=bp.user_id),1,0)) as P_n,
       count(distinct(if((u.date=bp.date)*(u.id=bp.user_id),bp.user_id,0))) as PU_1day,
       count(distinct(if(truncate(timestampdiff(hour,u.datetime,bp.datetime)/24,0)<7,bp.user_id,0))) as PU_7day
FROM mayadata.users u 
left join mayadata.billing_pays bp
       on u.id=bp.user_id
WHERE  u.country in ('TH','ZA','ID','IN','NG','MY') and
       truncate(timestampdiff(hour,u.datetime,bp.datetime)/24,0)<7 and 
       u.date>='2011-01-01' 
GROUP BY u.date, u.des_channel, u.des_type

Answer 1

您能否尝试将 PU_1day 和 PU_7day 计算表达式中的第二个参数从 0 替换为 null，如下所示:

SELECT u.date, 
       u.des_channel, 
       u.des_type, 
       u.country,
       count(distinct(u.id)) as Reg_n, 
       sum(if((u.date=bp.date)*(u.id=bp.user_id),bp.o_outcome,0)) as P_$,
       sum(if((u.date=bp.date)*(u.id=bp.user_id),1,0)) as P_n,
       count(distinct(if((u.date=bp.date)*(u.id=bp.user_id),bp.user_id,null))) as PU_1day,
       count(distinct(if(truncate(timestampdiff(hour,u.datetime,bp.datetime)/24,0)<7,bp.user_id,null))) as PU_7day
FROM mayadata.users u 
left join mayadata.billing_pays bp
       on u.id=bp.user_id
WHERE  u.country in ('TH','ZA','ID','IN','NG','MY') and
       truncate(timestampdiff(hour,u.datetime,bp.datetime)/24,0)<7 and 
       u.date>='2011-01-01' 
GROUP BY u.date, u.des_channel, u.des_type