SQL : Left Join multiple time the same table with different types , Duplicates lines adding the value in it

Question

我的问题是这个查询：

select 
  distinct 
  o1.id_personne,
  o1.id_table,
  tel.li_num_tel as Telephone,
  mail.li_url as EMail,
  fax.li_num_tel as Fax  
from table o1 
  Inner join personne p1 on 
    o1.id_personne = p1.id_personne 
  left join table_adresse a1 on
    o1.id_table = a1.id_table and 
    a1.co_type_adresse like 'TEL'
  left join table_adresse a2 on 
    o1.id_table = a2.id_table and 
    a2.co_type_adresse like 'NUM' 
  left join tabletel tel on 
    a1.id_table_tel = tel.id_table_tel and 
    tel.id_nature_adrtel = 1502 
  left join tabletel fax on 
    a1.id_table_tel = fax.id_table_tel and 
    fax.id_nature_adrtel = 1500
  left join tablenum mail on 
    a2.id_table_num = mail.id_table_num and 
    mail.id_nature_adrnum = 1400
where 
  p1.id_personne=1

这个结果：

|id_personne | id_table | telephone | email | Fax |
|1           | 5        | null      |test@te|null  |
|1           | 9        | null      |test@te|555 89|
|1           | 9        | 123 123 5 |test@te| null |

id 5 的值是正确的，但 id 9 与不同的值重复，它应该return同一行的 3 个（电子邮件 + 电话 + 传真）字段

Answer 1

看起来您在 table table_adresse 中有两行 id_table = 9 AND co_type_adresse like 'TEL'，具有不同的 li_num_tel 值。每个将与 table join personne 的同一行组合以产生结果行。因为结果行不同，所以都通过 DISTINCT 选择。

Answer 2

以下可能有效。函数 MAX 应忽略您的空值，因此在将 table_adresse 加入电话和传真表时合并重复的行

SELECT 
  distinct 
  o1.id_personne,
  o1.id_table,
  mail.li_url as EMail,
  X.li_num_tel as Fax  
  X.li_num_tel as Telephone,
from 
  table o1 
  Inner join personne p1 on 
    o1.id_personne = p1.id_personne 
  left join table_adresse a2 on 
    o1.id_table = a2.id_table and 
    a2.co_type_adresse like 'NUM'
  left join tablenum mail on 
    a2.id_table_num = mail.id_table_num and 
    mail.id_nature_adrnum = 1400
LEFT JOIN  
  (
  SELECT
    a1.id_table, 
    MAX(tel.li_num_tel) as Telephone,
    MAX(fax.li_num_tel) as Fax 
  FROM  table_adresse a1
    LEFT JOIN tabletel tel on 
      a1.id_table_tel = tel.id_table_tel and 
      tel.id_nature_adrtel = 1502 
    LEFT JOIN tabletel fax on 
      a1.id_table_tel = fax.id_table_tel and 
      fax.id_nature_adrtel = 1500
  WHERE co_type_adresse like 'TEL'
  GROUP BY a1.id_table
  ) X
  ON 
  o1.id_table = X.id_table
WHERE
  p1.id_personne=1

...或者在您的原始查询中，您可以试试这个：

 select 
  o1.id_personne,
  o1.id_table,
  MAX(tel.li_num_tel) as Telephone,
  MAX(mail.li_url) as EMail,
  MAX(fax.li_num_tel) as Fax  
from table o1 
  Inner join personne p1 on 
    o1.id_personne = p1.id_personne 
  left join table_adresse a1 on
    o1.id_table = a1.id_table and 
    a1.co_type_adresse like 'TEL'
  left join table_adresse a2 on 
    o1.id_table = a2.id_table and 
    a2.co_type_adresse like 'NUM' 
  left join tabletel tel on 
    a1.id_table_tel = tel.id_table_tel and 
    tel.id_nature_adrtel = 1502 
  left join tabletel fax on 
    a1.id_table_tel = fax.id_table_tel and 
    fax.id_nature_adrtel = 1500
  left join tablenum mail on 
    a2.id_table_num = mail.id_table_num and 
    mail.id_nature_adrnum = 1400
where 
  p1.id_personne=1
GROUP BY
  o1.id_personne,
  o1.id_table

SQL : Left Join multiple time the same table with different types , Duplicates lines adding the value in it

SQL : Left Join multiple time the same table with different types , Duplicates lines adding the value in it

sql

select

join

left-join