Question

我正在尝试更新数据库中的条目（PostgreSQL）。我在更新查询时遇到问题：

INSERT INTO prices (price, product_id)
SELECT 
product_price, commn_id
FROM products_temp as prod
WHERE NOT EXISTS 
(SELECT *
   FROM   prices od
   WHERE  prod.commn_id = od.product_id)
OR prod.product_price != 
( SELECT price
  FROM prices as p
  WHERE p.product_id = prod.commn_id
  order by p.end
  desc LIMIT 1 )

当我删除时查询工作正常：

OR prod.product_price != 
( SELECT price
  FROM prices as p
  WHERE p.product_id = prod.commn_id
  order by p.end
  desc LIMIT 1 )

所以在我看来，它正在循环执行此操作。我的问题是，我该如何解决？

Answer 1

我认为您的整个问题都来自prod.product_price !=中的运算符
我尝试过了，对我有用：

INSERT INTO prices (price, product_id)
SELECT 
product_price, commn_id
FROM products_temp as prod
WHERE NOT EXISTS 
(SELECT *
   FROM   prices od
   WHERE  prod.commn_id = od.product_id)
OR prod.product_price not in 
( SELECT price
  FROM prices as p
  WHERE p.product_id = prod.commn_id
  order by p.end
  desc LIMIT 1 )

希望它将对您有帮助！

SQL更新选择语句

1 个答案: