我有两张桌子发票和付款。发票有很多付款,我希望为所有发票行更新名为total_payments_amount
的字段,并在单个SQL查询中为每个发票行添加所有相关付款的总和。所以这就是我试过的
UPDATE invoices
SET total_payments_amount = pays.total_amount
FROM invoices inv
INNER JOIN (
SELECT invoice_id, SUM(amount) as total_amount
FROM payments
WHERE invoice_id IS NOT NULL
GROUP BY invoice_id
) pays
ON inv.id = pays.invoice_id
但运行此查询后,我发现所有记录都包含相同的值。那么这里有什么不对?
答案 0 :(得分:0)
尝试使用cte ..
;With cte_total
AS ( SELECT invoice_id, SUM(isnull(amount,0)) as total_amount
FROM payments
WHERE invoice_id IS NOT NULL
GROUP BY invoice_id)
UPDATE inv
SET inv.total_payments_amount = c.total_amount
FROM cte_total c
JOIN invoices inv
ON inv.id = c.invoice_id