如何在Distinct ON上使用计数

Question

我有这个查询已经有效，我需要为此写计数查询（需要分页），并且我在使用DISTINCT ON时使用count有问题，任何人都知道正确的语法和使用方法，我已经用谷歌搜索了，但是找不到DISTINCT ON的任何计数查询

结果，我期望此查询已经可以正常工作的总行数

select DISTINCT on (csd.team_contest_id)
        c.id as contestId
            from contest as c
            left join company_sponsor_team as csd on csd.contest_id = c.id
            left join sponsor as s on s.id = c.sponsor_id
            left join team as d on d.id = c.team_id
            left join player as m on c.creator_id = m.id
            WHERE c.id = c.id 
            AND ((c.team_id is not null and c.sponsor_id is null and lower(d.name) LIKE LOWER(CONCAT('%TAN%')))
            OR (c.team_id is not null and c.sponsor_id is not null and lower(s.name) LIKE LOWER(CONCAT('%TAN%')))
            OR (c.team_id is null and lower(s.name) LIKE LOWER(CONCAT('%TAN%')))) AND (CURRENT_DATE < c.archive_date)

Answer 1

如果要计算行数，请使用子查询：

select count(*)
from ( <your query here> ) x;

如果您不喜欢子查询，可以随时执行以下操作：

select count(distinct csd.team_contest_id)
from . . .  <the rest of your query here>;

假设csd.team_contest_id不为NULL ，则返回相同的值。