Question

如何在两个值上加入两个表？

select cases.*
from client_cases
inner join cases on client_cases.id = cases.timeline
left join customers on client_cases.customer_id = customers.id or customers.email = 'test@gmail.com'
where cases.timeline in (
    select timeline from cases where cases.payload -> 'person' ->> 'phone' ~ '4625152'
)

如果customers.email =＆＃39; test@gmail.com'，我试图获得结果。或者，如果cases.payload JSONB电话字段的值为＆＃39; 4625152＆＃39;

如果电话号码匹配，上述查询将仅返回结果。如果电子邮件中没有匹配且电话号码不匹配，则不会。

Answer 1

我认为将电子邮件条件放在WHERE子句中会更有意义。

select cases.*
from client_cases
inner join cases on client_cases.id = cases.timeline
left join customers on client_cases.customer_id = customers.id 
where cases.timeline in (
    select timeline from cases where cases.payload -> 'person' ->> 'phone' ~ '4625152'
) or customers.email = 'test@gmail.com'

Answer 2

on查找匹配行时使用join子句。 where子句用于在完成所有连接后过滤行。

您一直在与customers.email = 'test@gmail.com'进行联接，但是您使用WHERE case.timeline IN..对其进行了过滤..这说明了您的结果

SELECT cases.*
FROM client_cases
INNER JOIN cases ON (client_cases.id = cases.timeline)
LEFT JOIN customers ON (client_cases.customer_id = customers.id)
WHERE cases.timeline IN (
    SELECT timeline 
    FROM cases 
    WHERE cases.payload -> 'person' ->> 'phone' ~ '4625152'
) OR customers.email = 'test@gmail.com'

两个表上的SQL连接

2 个答案: