SQL的錯誤，因爲以後凡在

Question

我寫了一些sql語句，並且有一定的問題。

SELECT uri, k.score_x 
    FROM uris 
    WHERE id IN (
    SELECT id, SUM(x) AS score_x 
     FROM keywords 
     WHERE key = 'key1' OR 
     key='key2' OR 
     key='key3' OR 
     key='key4' 
     GROUP BY id 
     HAVING COUNT(key) = 4 
) AS k 
    ORDER BY k.score_sum DESC; 

這是我的發言，但我的數據庫（PostgreSQL的），說有一個語法錯誤與我的「AS」。

但是北京時間問題？ o.O我不明白

Answer 1

你需要一個連接，如：

SELECT 
    uri, 
    sum(k.x) as score_x 
FROM uris u 
JOIN keywords k 
ON u.id = k.id 
WHERE k.key in ('key1', 'key2', 'key3', 'key4') 
ORDER BY score_x DESC; 

不知道你試圖用HAVING COUNT（鍵）= 4來表達，雖然。

Answer 2

你似乎想是這樣的：

SELECT u.uri, k.score_x 
FROM uris u JOIN 
    (SELECT id, SUM(x) AS score_x 
     FROM keywords 
     WHERE k.key in ('key1', 'key2', 'key3', 'key4') 
     GROUP BY id 
     HAVING COUNT(DISTINCT key) = 4 
    ) k 
    ON u.id = k.id 
ORDER BY k.score_sum DESC;