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Question

我有兩個表「發票」和「invoices_account」

通過查詢

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') 

我拿到發票的金額，每年這樣的：

2011 | 80 
2012 | 120 

等。

我需要的是在第一個查詢中，按年份從「invoices_account」。「inv_total」中獲取所有條目的摘要。關係是1：1。這意味着2011年的80份發票在「invoices_account」中有80行。我需要有這樣的事情

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

Answer 1

檢查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')