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Content in the association settings of two mysql tables

Source: Internet
Author: User
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Goods_id is the primary key of goods in the first table, and the price is price. The product in the other table has the foreign key goods_id and the price is price. If price0 in product is required, set the price value to the price in the goods table. how can I write this SQL statement? thank you for choosing mysqlsql

Goods_id is the primary key of goods in the first table, and the price is price. The product in the other table has the foreign key goods_id and the price is price. If the price in the product is set to 0, set the price value to the price in the goods table. thank you for writing this SQL statement.

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