如何在PostgreSQL中编写选择查询以遍历选择查询返回的数组

Question

SELECT b_items_p_id FROM  public.box WHERE b_id =1

and this is what it returns：

{1,3,5}

现在每个值，即1、3和5，我想运行另一个选择查询：

select p_desc from public.products where p_id = 1

Answer 1

您可以使用box运算符加入products和any()，如下所示：

select p_desc 
from public.box b 
inner join public.products p on p.p_id = any(b.b_items_p_id)
where b.b_id =1