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[英]MySQL query with sub-select in IN()-clause gives not enough results
[英]Using the result of a sub-select in the WHERE clause in a MySQL query
SELECT
*, (SELECT SUM(rating) FROM votes WHERE votes.postId = posts.id) AS rating
FROM posts
WHERE rating > 10
我的表格中有多個條目,其中具有相應帖子ID的投票的評分總和大於10,但是此查詢未返回任何結果。 為什么?
這是我的數據庫結構的相關部分:
TABLE posts
- id
TABLE votes
- postId
- rating
任何幫助將不勝感激。
您需要這樣命名子查詢列
SELECT * FROM(選擇sum(rating)為rating_sum,* FROM帖子)AS評分INNER JOIN帖子中的帖子。id= rating.id WHERE評分。rating_sum> 10
嘗試這個。
SELECT posts.*, (select SUM(rating) as totalRating
from votes
where votes.postid = posts.id) as totalRating
FROM posts
WHERE totalRating > 10
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