Просьба пояснить, как выразить этот SQL как единый оператор, используя производные таблицы

Question

Для моего собственного наставления я пытаюсь написать эту функциональность SQL в одном выражении без использования временных таблиц. Для моей жизни я не могу заставить запрос работать без получения MySQL «ERROR 1248 (42000): каждая производная таблица должна иметь свой собственный псевдоним».

Вот что-то похожее, хотя и сломаны, что я хочу:

SELECT split.share, split.weight, split.creditor, split.debtor, share.amount, wsum.sum 
FROM (
    SELECT split.share, split.weight, split.creditor, split.debtor, share.amount 
    FROM (split LEFT JOIN share ON split.share = share.id) 
    WHERE debtor = 6 OR creditor = 6) 
    LEFT JOIN (
     SELECT split.share, SUM(weight) AS sum 
     FROM split 
     GROUP BY split.share 
    ) wsum 
    ON split.share = wsum.share; 

Вот рабочая версия о том, что я пытаюсь экспрессирован с использованием временных таблиц:

CREATE TEMPORARY TABLE weightsum (share INT, sum INT); 

INSERT INTO weightsum (share, sum) 
SELECT split.share, SUM(weight) AS sum 
FROM split 
GROUP BY split.share; 

CREATE TEMPORARY TABLE summary (share INT, weight INT, creditor INT, debtor INT, amount DECIMAL(10,2)); 

INSERT INTO summary (share, weight, creditor, debtor, amount) 
SELECT split.share, split.weight, split.creditor, split.debtor, share.amount 
FROM (split LEFT JOIN share ON split.share = share.id) 
WHERE debtor = 6 OR creditor = 6; 

SELECT summary.share, summary.weight, weightsum.sum, summary.creditor, summary.debtor, summary.amount, ((summary.amount/weightsum.sum) * summary.weight) AS split_amount 
FROM summary LEFT JOIN weightsum 
ON summary.share = weightsum.share; 

Спасибо за помощь ,

Answer 1

Попробуйте это:

SELECT split.share, split.weight, split.creditor, split.debtor, share.amount, wsum.sum 
FROM (
    SELECT split.share, split.weight, split.creditor, split.debtor, share.amount 
    FROM split 
    LEFT JOIN share 
    ON split.share = share.id 
    WHERE debtor = 6 OR creditor = 6 
) As split 
LEFT JOIN (
    SELECT split.share, SUM(weight) AS sum 
    FROM split 
    GROUP BY split.share 
) wsum 
ON split.share = wsum.share; 

Или более правильно написано:

SELECT split.share, split.weight, split.creditor, split.debtor, share.amount, wsum.sum 
FROM split 
LEFT JOIN share 
ON split.share = share.id 
LEFT JOIN (
    SELECT split.share, SUM(weight) AS sum 
    FROM split 
    GROUP BY split.share 
) wsum 
ON split.share = wsum.share 
WHERE split.debtor = 6 OR split.reditor = 6;