Question

我试图通过使用左联接获取结果从表中获取所有记录（组，雀巢，客户，目标，派别），如果用户ID不存在，则获取0（例如：未将目标分配给膜）我不知道我是否能有效解释，但这是我的查询：

select CONCAT(s.firstname, ' ', s.lastname) AS Membre, g.achievement AS Objectif, count(l.assigned) AS `num_l`, count(c.id_fiche) AS `num_c`,
(count(c.id_fiche)/count(l.assigned))*100 AS `perc`, SUM(f.total) AS `glob`, (g.achievement - SUM(f.total)) AS `rest`, (SUM(f.total)/g.achievement)*100 AS `taux` 
from `groups` s 
LEFT JOIN `fiches` l ON s.id_membre=l.assigned LEFT JOIN `clients` c ON l.id=c.id_fiche 
LEFT JOIN `goals` g ON s.id_membre=g.id_membre LEFT JOIN `factures` f ON s.id_membre=f.addedfrom 
WHERE l.dateassigned BETWEEN  '2020-08-01' AND '2020-08-31' AND f.status=2 
GROUP BY s.id_membre

我得到的结果是为其分配了目标的成员，但是我需要的是所有成员，而没有为其分配目标的成员在与目标相关的字段中得到0。谢谢。

Answer 1

LEFT JOIN很好。您已选择通过添加INNER JOIN子句将其变成WHERE。

使用LEFT JOIN时，除第一个表外的所有过滤条件应该处于ON条件中。

select CONCAT(s.firstname, ' ', s.lastname) AS Membre, g.achievement AS Objectif, 
       count(l.assigned) AS `num_l`, count(c.id_fiche) AS `num_c`, 
       (count(c.id_fiche)/count(l.assigned))*100 AS `perc`, SUM(f.total) AS `glob`, (g.achievement - SUM(f.total)) AS `rest`,
      (SUM(f.total)/g.achievement)*100 AS `taux`
from `groups` s LEFT JOIN
     `fiches` l
     ON s.id_membre = l.assigned AND
        l.dateassigned BETWEEN '2020-08-01' AND '2020-08-31' LEFT JOIN
     `clients` c
     ON l.id = c.id_fiche LEFT JOIN
     `goals` g
     ON s.id_membre = g.id_membre LEFT JOIN
     `factures` f
     ON s.id_membre = f.addedfrom AND f.status=2
GROUP BY s.id_membre

Answer 2

您需要更改查询范围-

select CONCAT(s.firstname, ' ', s.lastname) AS Membre,
       g.achievement AS Objectif,
       count(l.assigned) AS `num_l`,
       count(c.id_fiche) AS `num_c`,
       (count(c.id_fiche)/count(l.assigned))*100 AS `perc`,
       SUM(f.total) AS `glob`,
       (g.achievement - SUM(f.total)) AS `rest`,
       (SUM(f.total)/g.achievement)*100 AS `taux`
  from `groups` s
  LEFT JOIN `fiches` l ON s.id_membre=l.assigned
                       AND l.dateassigned BETWEEN  '2020-08-01' AND '2020-08-31'
  LEFT JOIN `clients` c ON l.id=c.id_fiche
  LEFT JOIN `goals` g ON s.id_membre=g.id_membre
  LEFT JOIN `factures` f ON s.id_membre=f.addedfrom
                         AND f.status=2
 GROUP BY s.id_membre

Answer 3

您只在运行左联接，因此不知道所有表，我的第一个直觉是在“ groups”表（所选的第一个表）中缺少成员本身。或者，尝试删除WHERE和AND条件，然后查看丢失的用户是否回来。

左联接不获取所有记录

3 个答案: