SQL查询一对多

Question

I need SQL query for the below scenario.我需要以下场景的 SQL 查询。

2 tables: price & product 2 表：价格和产品

price table has ManyToOne relationship with product(ie, many prices were applicable to one product).价格表与产品具有多对一关系（即，多个价格适用于一种产品）。

Now I need a query to get only the product details which available in price table.现在我需要查询以仅获取价格表中可用的产品详细信息。

Note: Using hibernate, I have specified in price as注意：使用休眠，我已将价格指定为

@ManyToOne @JoinColumn(name = "PRODUCT_ID") private Product product; @ManyToOne @JoinColumn(name = "PRODUCT_ID") 私有产品；

But I don't specify OneToMany in product.但我没有在产品中指定 OneToMany。

Answer 1

In this case you can return the product attribute in your query, example:在这种情况下，您可以在查询中返回产品属性，例如：

select p.product from price p where p = :price

Hope this can help.希望这能有所帮助。 :) :)