Question

我有两张桌子＆＃34;发票＆＃34;和＆＃34; invoices_account＆＃34;

按查询

SELECT DATE_FORMAT(inv_created, '%Y') as 'year',
       COUNT(*) as 'total' 
FROM invoices as i 
WHERE inv_way = "OUT" 
GROUP BY DATE_FORMAT(inv_created, '%Y')

我每年都会收到发票金额：

2011 | 80
2012 | 120

等等。

我需要的是获取＆＃34; invoices_account＆＃34;。＆＃34; inv_total＆＃34;的所有条目的摘要。在第一个查询中按年份。关系是1：1。这意味着，2011年的80张发票在＆＃34; invoices_account＆＃34;中有80行。我需要有这样的东西

2011 | 80  | 1.000.000 €
2012 | 120 | 230.000.000 €

Answer 1

检查 INNER JOIN

SELECT DATE_FORMAT(inv_created, '%Y') as 'year',
       COUNT(*) as 'total', 
       SUM(ia.inv_total) as money_total
FROM invoices as i 
JOIN invoices_account ia
  ON i.id = ia.id
WHERE inv_way = "OUT" 
GROUP BY DATE_FORMAT(inv_created, '%Y')

使用group by从其他表中选择sum

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