如何在一个 mysql 查询中合并来自不同表的多个计数？

Question

我有几个不同的查询要获得一些计数器。是否可以将这些查询合并为一个，而不是对计数器进行求和和联合？

例如：

SELECT
  COUNT(uuid) AS total_admins ta,
  SUM(CASE WHEN isPublished = 1 THEN 1 ELSE 0 END) AS total_admins_published tap,
  SUM(CASE WHEN isPublished = 0 THEN 1 ELSE 0 END) AS total_admins_unpublished tau
FROM admins

和

SELECT
  COUNT(uuid) AS total_mediators tm,
  SUM(CASE WHEN isPublished = 1 THEN 1 ELSE 0 END) AS total_mediators_published tmp,
  SUM(CASE WHEN isPublished = 0 THEN 1 ELSE 0 END) AS total_mediators_unpublished tmu
FROM mediator

和

SELECT
  COUNT(uuid) AS total_posts tp,
  SUM(CASE WHEN submissionDate BETWEEN "start" AND "end" THEN 1 ELSE 0 END) AS total_posts_week tpw,
  SUM(CASE WHEN submissionDate BETWEEN "start" AND "end" THEN 1 ELSE 0 END) AS total_posts_month tpm,
  SUM(CASE WHEN submissionDate BETWEEN "start" AND "end" THEN 1 ELSE 0 END) AS total_posts_year tpy
FROM posts

以及我的期望：

| ta | tap | tau | tm | tmp | tmu | tp  | tpw | tpm | tpy |
|----|-----|-----|----|-----|-----|-----|-----|-----|-----|
| 20 | 10  | 10  | 12 | 10  | 2   | 230 | 30  | 180 | 220 |

Answer 1

您可以 CROSS JOIN 三个查询：

SELECT ta, tap, tau, tm, tmp, tmu, tp, tpw, tpm, tpy
FROM (
    SELECT
      COUNT(uuid) AS total_admins ta,
      SUM(CASE WHEN isPublished = 1 THEN 1 ELSE 0 END) AS total_admins_published tap,
      SUM(CASE WHEN isPublished = 0 THEN 1 ELSE 0 END) AS total_admins_unpublished tau
    FROM admins
) a
CROSS JOIN (
    SELECT
      COUNT(uuid) AS total_mediators tm,
      SUM(CASE WHEN isPublished = 1 THEN 1 ELSE 0 END) AS total_mediators_published tmp,
      SUM(CASE WHEN isPublished = 0 THEN 1 ELSE 0 END) AS total_mediators_unpublished tmu
    FROM mediator
) m
CROSS JOIN (
    SELECT
      COUNT(uuid) AS total_posts tp,
      SUM(CASE WHEN submissionDate BETWEEN "start" AND "end" THEN 1 ELSE 0 END) AS total_posts_week tpw,
      SUM(CASE WHEN submissionDate BETWEEN "start" AND "end" THEN 1 ELSE 0 END) AS total_posts_month tpm,
      SUM(CASE WHEN submissionDate BETWEEN "start" AND "end" THEN 1 ELSE 0 END) AS total_posts_year tpy
    FROM posts
) p

如何在一个 mysql 查询中合并来自不同表的多个计数？

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