从 Mysql SELECT 查询问题中过滤空行

Question

我有一个 SELECT 查询如下：

SELECT basket_id
     , b.amount_due - SUM(p.amount_paid) as due_balance
FROM basket_due b
  LEFT JOIN basket_payment p USING (basket_id)
WHERE b.customer_id = 4
GROUP BY customer_id, basket_id
ORDER BY basket_id desc

这个查询给我这样的输出：

+-----------+-------------------+
| basket_id |       due_balance |
+-----------+-------------------+
|        16 |            999.50 |
|        15 |              0.00 |
|        13 |              0.00 |
|        11 |           1716.00 |
|         9 |           1210.00 |
|         7 |            140.00 |
+-----------+-------------------+

我的问题是，如何从 due_balance 中筛选出 0 条到期记录并修改查询以获取其余记录？

预期结果应该是：

+-----------+-------------------+
| basket_id |       due_balance |
+-----------+-------------------+
|        16 |            999.50 |
|        11 |           1716.00 |
|         9 |           1210.00 |
|         7 |            140.00 |
+-----------+-------------------+

我试过这种方法，但对我不起作用。

SELECT basket_id
     , b.amount_due - SUM(p.amount_paid) as due_balance
FROM basket_due b
  LEFT JOIN basket_payment p USING (basket_id)
WHERE b.customer_id = 4 AND due_balance > 0 
GROUP BY customer_id, basket_id
ORDER BY basket_id desc

Answer 1

尝试使用 <> 0。应该可行。

Answer 2

到期余额的非零断言属于 HAVING 子句：

SELECT basket_id,
      b.amount_due - SUM(p.amount_paid) AS due_balance
FROM basket_due b
LEFT JOIN basket_payment p USING (basket_id)
WHERE b.customer_id = 4
GROUP BY customer_id, basket_id
HAVING due_balance > 0
ORDER BY basket_id DESC;

Answer 3

使用 HAVING 子句或使用子查询然后在 WHERE 子句外添加条件。

SELECT basket_id
     , b.amount_due - SUM(p.amount_paid) as due_balance
FROM basket_due b
  LEFT JOIN basket_payment p USING (basket_id)
WHERE b.customer_id = 4
GROUP BY customer_id, basket_id
Having due_balance > 0 
ORDER BY basket_id desc

SELECT t.basket_id
     , t.due_balance
FROM (SELECT basket_id
           , b.amount_due - SUM(p.amount_paid) as due_balance
      FROM basket_due b
      LEFT JOIN basket_payment p USING (basket_id)
      WHERE b.customer_id = 4
      GROUP BY customer_id, basket_id) t
WHERE t.due_balance > 0
ORDER BY t.basket_id desc

Answer 4

你需要使用 having

SELECT basket_id
     , b.amount_due - SUM(p.amount_paid) as due_balance
FROM basket_due b
  LEFT JOIN basket_payment p USING (basket_id)
WHERE b.customer_id = 4
GROUP BY customer_id, basket_id
Having due_balance > 0 
ORDER BY basket_id desc

从 Mysql SELECT 查询问题中过滤空行

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