Question

im试图总结并显示mysql中的所有注册表。我有这个查询：

select `deliverables`.*, 
       `users`.`first_name`, 
       `users`.`last_name` 
from `deliverables` 
inner join `users` on `users`.`id` = `deliverables`.`user_id` 
where `deliverables`.`specialty_id` = '11' and 
      `deliverables`.`role_id` <> '1'

，输出为：

file_code  file_name       dedicated_hours

0001asder  test-file.docx  4
0001as234w asdf.doc        2
jgfjh2546  test.docx       4
0001asder  test-file.docx  1
0001asder  test-file.docx  0
0001asder  test-file.docx  0

我需要将“ file_code”相等的“专用时间”加起来，所以它应该像这样：

file_code  file_name       dedicated_hours  sum

0001asder  test-file.docx  4                5
0001as234w asdf.doc        2                2
jgfjh2546  test.docx       4                4
0001asder  test-file.docx  1                5
0001asder  test-file.docx  0                5
0001asder  test-file.docx  0                5

im使用sum（dedicated_hours）并按file_code分组，但仅显示：

file_code  file_name       dedicated_hours  sum

0001asder  test-file.docx  4                5
0001as234w asdf.doc        2                2
jgfjh2546  test.docx       4                4

我如何同时汇总和显示所有注册表？

Answer 1

您的MySQL版本（5.0.12）不支持Window Functions（应该有足够的诱因来升级以获得最新的好东西：）

尽管如此，我们可以使用Derived Table来单独确定SUM()的汇总file_code。然后，我们可以简单地联接回主表以显示sum列。

SELECT 
  d.file_code,
  d.file_name, 
  d.dedicated_hours,  
  dt.sum, 
  u.first_name, 
  u.last_name 
FROM deliverables AS d 
JOIN users AS u 
  ON u.id = d.user_id 
JOIN
(
  SELECT file_code, 
         SUM(dedicated_hours) AS sum 
   WHERE speciality_id = '11' AND 
         role_id <> '1'
   GROUP BY file_code
) AS dt 
  ON dt.file_code = d.file_code
WHERE d.speciality_id = '11' AND 
      d.role_id <> '1'

MySQL 8.0.2 and above解决方案将仅使用SUM(..) OVER (..)

SELECT 
  d.file_code,
  d.file_name, 
  d.dedicated_hours,  
  SUM(d.dedicated_hours) OVER (PARTITION BY d.file_code) AS sum, 
  u.first_name, 
  u.last_name 
FROM deliverables AS d 
JOIN users AS u 
  ON u.id = d.user_id 
WHERE d.speciality_id = '11' AND 
      d.role_id <> '1'

mysql sum并显示所有注册表

1 个答案: