mysql - SQL触发器在插入后更新另一个表列

Question

我有一个名为Ratingscolumns User_No、Recipe_No和Rating

插入后，我想更新Avg_Rating另一个名为Recipes.

我是 SQL 语法的新手，但这基本上是我想要做的

CREATE TRIGGER `Update_Avg` AFTER INSERT ON `Ratings`
FOR EACH ROW 
SELECT @recipeNo = Recipe_No FROM INSERTED;

SELECT @avg = AVG(Rating) FROM databs.Ratings WHERE
`Recipe_No` = @recipeNo;

INSERT INTO databs.Recipes (`Avg_Rating`) VALUES (@avg)
WHERE `Recipe_No` = @recipeNo;