为什么这个查询不能在 SQLite 中工作，但在 MySQL 和 MSAccess 中工作正常？

Question

我有一个相当复杂的 SQL 查询，如图所示 in this fiddle

SELECT payer_payment.payer_id, 
       Sum(payer_payment.amount)                             AS total_paid, 
       Sum(payer_payment.pays * payments_share.single_share) AS fair_share 
FROM   payers 
       INNER JOIN (payer_payment 
                   INNER JOIN (SELECT payment_id, 
                                      Sum(amount) / Sum(pays) AS single_share 
                               FROM   payer_payment 
                               GROUP  BY payment_id) AS payments_share 
                           ON payer_payment.payment_id = 
                              payments_share.payment_id) 
               ON payers.id = payer_payment.payer_id 
WHERE  payers.user_id  = 1 
GROUP  BY payer_payment.payer_id; 

在小提琴中，它在 MySQL 上运行良好，但是当我在 SQLite 数据库上运行它时，它要么抛出错误，引用：

（1 没有这样的列：payer_payment.payer_id）

当该列明确存在时。

或者只是返回 0 个结果，具体取决于 SQLite 实现（WebSQL 与 SQLite.js）

这是什么原因？是否有可能使我的查询更加与数据库无关？

Answer 1

在 SQLite 中，您可以使用 INTEGER PRIMARY KEY 获得一个自动递增的列。 （如果你在查询中依赖payers.id 的实际值，你应该明确地给出它们。）

您不应该在不需要时尝试嵌套连接：

SELECT payer_payment.payer_id,
       Sum(payer_payment.amount)                             AS total_paid,
       Sum(payer_payment.pays * payments_share.single_share) AS fair_share
FROM       payers
INNER JOIN payer_payment
        ON payers.id = payer_payment.payer_id
INNER JOIN (SELECT payment_id,
                   Sum(amount) / Sum(pays) AS single_share
            FROM   payer_payment
            GROUP  BY payment_id) AS payments_share
        ON payer_payment.payment_id = payments_share.payment_id
WHERE payers.user_id = 1
GROUP BY payer_payment.payer_id;

SQLFiddle