子查询应该总是 select 语句吗？

Question

select * from product where customer_id = (delete from product where product_id = 5 and customer_id = 1 returning customer_id);

当我运行上面的查询时，我得到：

错误：“from”处或附近的语法错误

但是运行ning delete from product where product_id = 5 and customer_id = 1 returning customer_id 单独工作正常并返回 customer_id。

所以问题是子查询是否总是 select 语句？有没有其他方法可以在一个查询中删除和 select？

Answer 1

使用 CTE：

with d as (
      delete from product
      where product_id = 5 and customer_id = 1
      returning customer_id
     )
select p.*
from product p
where p.customer_id in (select d.customer_id from d);

子查询应该总是 select 语句吗？

Should Subqueries always be select statements?

sql

postgresql

subquery