将聚合插入数组

Question

我想在以下查询中获取聚合数组（这不起作用）

select
    c.app_id,
    90 as interval,
    'day_of_week' as group,
    array_agg(
        count(extract(dow from c.inserted_at) = 0 or null),
        count(extract(dow from c.inserted_at) = 1 or null),
        count(extract(dow from c.inserted_at) = 2 or null),
        count(extract(dow from c.inserted_at) = 3 or null),
        count(extract(dow from c.inserted_at) = 4 or null),
        count(extract(dow from c.inserted_at) = 5 or null),
        count(extract(dow from c.inserted_at) = 6 or null)
    ) as series
from conversations c
left join apps a on c.app_id = a.id
where c.inserted_at::date > (current_date - (90  || ' days')::interval)::date
group by app_id

抛出语法错误

Answer 1

Ryan是对的，你正在做的是一个聚合（array_agg）消耗另一个（count）。那不对。

按照建议尝试ARRAY[..]。