是否有可能在此查詢中獲得overall_score的總和？

所以我有一個鏈接表和這些鏈接的投票表。因此，例如，鏈接google.co.uk在鏈接表中有一條記錄，然後在投票表中可以有四個投票記錄，每個記錄的得分爲-1,1或2。我已經完成了對每個鏈接的投票進行總結的這個查詢，但是有可能將同一個查詢中的所有鏈接的所有得分相加，所以用戶有一個得分？是否有可能在此查詢中獲得overall_score的總和？

SELECT *, SUM(v.vote_score) AS overall_score 
FROM mdl_link_critic_links l 
    JOIN mdl_link_critic_votes v on l.id = v.link_id 
WHERE l.user_id = '3' 
GROUP BY l.id

結果是一樣

google.co.uk, user_id 3, overall_score 3 
ebay.co.uk , user_id 3, overall_score 4 
stackoverflow.com, user_id, 3, overall_score 10

，我想總結所有的總分，所以在這種情況下，這將是17

來源

2016-06-07 Rich

* 「所以在這種情況下，這將是17」 * - 你的意思是16. 3,3，3,4和3讓16，不17. ;-) –

不，總和領域overall_score，3 + 4 + 10使17 :) – Rich

'WITH ROLLUP'它會給你null，null，17' – splash58

什麼子查詢？它看起來像這樣或多或少：

SELECT x.user_id, SUM(overall_score) AS user_score 
FROM (
    SELECT *, SUM(v.vote_score) AS overall_score 
    FROM mdl_link_critic_links l 
    JOIN mdl_link_critic_votes v on l.id = v.link_id 
    GROUP BY l.id 
) AS x 
GROUP BY x.user_id;

來源

2016-06-07 14:32:49

SELECT l.id, l.name, v.user_id, v.vote_score AS user_score, o.overall_score 
FROM mdl_link_critic_links l 
JOIN mdl_link_critic_votes v ON v.link_id = l.id 
JOIN (SELECT v.link_id, SUM(v.vote_score) AS overall_score 
     FROM mdl_link_critic_votes v 
     GROUP BY v.link_id) o ON o.link_id = l.id

來源

2016-06-07 14:53:26

是否有可能在此查詢中獲得overall_score的總和？

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