两个虚拟列的数量差异

Question

我想得到两列之间的区别，这是我当前的查询：

select customer_id as customers_id, sum(amount) as manual_amount,
       (select amount from customers where id = customers_id) as current_wallet_amount
FROM wallet_transactions 
where customer_id = 14438 
group by wallet_transactions.customer_id

我得到的结果附在下面：

我需要的是手动金额和 current_wallet_amount 的差异。 任何帮助将是非常可观的

Answer 1

你可以试试下面——

With cte as
(
    select customer_id as customers_id, sum(amount) as manual_amount,
    (select amount from customers where id = customers_id) as current_wallet_amount,
    FROM wallet_transactions 
    where customer_id = 14438 
    group by wallet_transactions.customer_id
)

select  customers_id,manual_amount,current_wallet_amount,
manual_amount-current_wallet_amount as difference
from cte

Answer 2

SELECT wt.customer_id AS customers_id, SUM(wt.amount) AS manual_amount, ANY_VALUE(customers.amount) AS current_wallet_amount, (SUM(wt.amount) - ANY_VALUE(customers.amount)) AS diff_amount FROM wallet_transactions AS wt JOIN customers ON customers.id = wt.customer_id WHERE customer_id = 14438 GROUP BY wt.customer_id

Answer 3

SELECT cu.id AS customers_id, 
       SUM(wt.amount) AS manual_amount, 
       cu.amount AS current_wallet_amount,
       SUM(wt.amount) - cu.amount AS difference
FROM wallet_transactions AS wt
JOIN customers cu ON cu.id = wt.customer_id
WHERE cu.id = 14438 
GROUP BY cu.id, cu.amount