多重过滤（where ...）条件 PostgreSQL

Question

我正在尝试运行使用多个过滤器进行以下查询。我不断收到错误消息。如果我单独运行过滤器，查询运行没问题。多个过滤器（其中...）是否不起作用？

select count(distinct a.user) as total
    ,count(distinct a.user) filter (where d.date >= current_date - '1 day'::interval) as 1_day
    ,count(distinct a.user) filter (where d.date >= current_date - '3 days'::interval) as 3_day
    ,count(distinct a.user) filter (where d.date >= current_date - '1 week'::interval) as 1_week
    ,count(distinct a.user) filter (where d.date >= current_date - '1 month'::interval) as 1_month
    from ppl d
    join
                (select distinct t.user from tbl t
                join date dd
                    on t.date::date between dd.month_start and dd.month_end
                where dd.date = current_date - '14 days'::INTERVAL
                ) as a
    on d.user = a.user

我收到此错误：

[Err] ERROR:  syntax error at or near "1"
LINE 2: ....lastedit_date >= current_date - '1 day'::interval) as 1_day
                                                                  ^

Answer 1

来自docs：

SQL identifiers and key words must begin with a letter (a-z, but also letters with diacritical marks and non-Latin letters) or an underscore (_)

这意味着 1_day 不是有效的标识符，您不能将其用作不带双引号的列名。

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