以下查询为每次recipecomments.RecipeID出现时都会记录一条记录,我只想为每个recipeID带一条记录,按recipeid分组似乎不起作用
SELECT recipecomments.RecipeID
,recipecomments.CommentID
,recipes.RecipeID
,recipes.Name
,recipes.CategoryID
,recipes.RatingTotal
,recipes.ImageMed
FROM recipecomments
JOIN recipes ON recipecomments.RecipeID = recipes.RecipeID
ORDER BY recipecomments.CommentID
答案 0 :(得分:1)
如果您按recipeid进行分组,则需要确定要显示的CommentID。 从你的语法来看,我猜的是最高的。
SELECT
recipecomments.RecipeID,
MAX(recipecomments.CommentID),
recipes.RecipeID,
recipes.Name,
recipes.CategoryID,
recipes.RatingTotal,
recipes.ImageMed
FROM recipecomments
JOIN recipes ON recipecomments.RecipeID = recipes.RecipeID
group by
recipecomments.RecipeID,
recipes.RecipeID,
recipes.Name,
recipes.CategoryID,
recipes.RatingTotal,
recipes.ImageMed