Question

我目前有一个搜索功能，我需要它来从不同的表中返回值（如果值存在）

SELECT crm.lead_id, 
       crm.id, 
       url, 
       contact, 
       info, 
       status_id, 
       added, 
       last_edited, 
       callback_date, 
       user.user, 
       status.status, 
       crm_updates.status_info
  FROM crm, 
       user, 
       status, 
       crm_updates
 WHERE (url LIKE  '%$search%'
      OR contact LIKE  '%$search%'
      OR info LIKE  '%$search%'
      OR status_id LIKE  '%$search%'
      OR added LIKE  '%$search%'
      OR last_edited LIKE  '%$search%'
      OR callback_date LIKE  '%$search%'
      OR user.user LIKE  '%$search%')
  AND crm.lead_id = user.id
  AND status.id = crm.status_id
  AND crm_updates.crm_id = crm.id

我需要来自crm_updates的status_info，它们目前通过crm_id（在crm_updates中）和id（在crm中）连接

现在只选择具有status_info的值。我需要选择所有值，如果存在则包含status_info。

Answer 1

SELECT crm.lead_id, crm.id, url, contact, info, status_id, added, last_edited, callback_date, user.user, status.status, crm_updates.status_info
FROM crm
INNER JOIN user
ON crm.lead_id = user.id
INNER JOIN status
ON crm.status_id = status.id
LEFT JOIN crm_updates
ON crm.id = crm_updates.crm_id 
WHERE url LIKE  '%$search%'
OR contact LIKE  '%$search%'
OR info LIKE  '%$search%'
OR status_id LIKE  '%$search%'
OR added LIKE  '%$search%'
OR last_edited LIKE  '%$search%'
OR callback_date LIKE  '%$search%'
OR user.user LIKE  '%$search%'

使用'LEFT JOIN crm_updates'：所以如果没有crm_updates的记录，将返回NULL。

提示：不要将join子句放在查询的where部分

Answer 2

如何更改行

AND status.id = crm.status_id

到

AND status.id = * crm.status_id

MYSQL选择是否存在（来自不同的表）

2 个答案: