在Postgres中组合AND OR语句

Question

我想写一个查询，它通过许多不同的条件选择记录，并使用运算符AND和OR。

如果我编写以下查询，例如，如何保留前两个条件（network_id = 1 and payment_plan_id = 77）而不在OR语句后重写它们？

select * from transactions where network_id = 1 and payment_plan_id = 
77 and payment_type = 'Subscription' OR payment_type = 'Renewal'

Answer 1

使用括号：

select *
from transactions
where network_id = 1 and payment_plan_id = 77 and 
      (payment_type = 'Subscription' OR payment_type = 'Renewal')

或者，更好的是，使用in：

select *
from transactions
where network_id = 1 and payment_plan_id = 77 and 
      payment_type in ('Subscription', 'Renewal')

Answer 2

使用IN避免括号混淆

select * from transactions 
where network_id = 1 
and payment_plan_id = 77 
and payment_type IN ('Subscription' , 'Renewal')