Question

我看过多篇与我的问题类似的帖子，但似乎都没有解决我的问题。

即使他们对该供应商的价值为零，我也试图将所有月份都记录下来。正如其他帖子中所建议的那样，我创建了另一个包含所有月份和年份数的表（实际上是视图）。然后在该视图上使用LEFT JOIN来尝试获取所有月份。

我还从另一篇文章中了解到将我的WHERE条件移动到连接ON条件。仍然没有快乐。

这是我的查询，但我没有收到每个供应商的所有12个月，只收到那个月有记录的供应商。

SELECT  
    Supplier, [Supplier Name],
    m.[MonthNum Received] AS MonthNum,
    m.[Year Received] AS [Year],
    COUNT(OTD) AS [All], SUM(CASE WHEN s.OTD = 'Early' THEN 1 ELSE 0 END) AS Early,
    SUM(CASE WHEN s.OTD = 'Ontime' THEN 1 ELSE 0 END) AS OnTime,
    SUM(CASE WHEN s.OTD = 'Late' THEN 1 ELSE 0 END) AS Late,
    SUM([Receipt Quantity]) AS Qty,
    CAST(100 - CAST(SUM(CASE WHEN s.OTD = 'Late' THEN 1 WHEN s.OTD = 'Early' THEN 1 ELSE 0 END) AS DECIMAL(18, 0)) / COUNT(OTD) * 100 AS DECIMAL(18, 0)) AS [Percent]
FROM    
    [v_DA006-RECEIPTS_Months] m 
LEFT JOIN 
    dbo.[v_DA006-RECEIPTS] AS s ON m.[MonthNum Received] = s.[MonthNum Received] 
                                  AND m.[Year Received] = s.[Year Received] 
                                  AND (s.[Receipt Quantity] <> 0)
GROUP BY 
    Supplier, [Supplier Name], m.[MonthNum Received], m.[Year Received]

Answer 1

首先，您需要供应商。如果没有供应商表，您应该从交易中提取它们，然后加入您想要报告的月份，最后加入交易。

SELECT ...
FROM Suppliers a
     CROSS JOIN Months b
     LEFT JOIN Transactions c 
       ON a.Supplier = c.Supplier 
       AND b.year = c.year
       AND b.month = c.month
WHERE ...

这应该为每个供应商提供至少一行，年，月，最终在交易中使用空值。然后你可以分组并总结。

SQL LEFT JOIN不返回所有预期的行

1 个答案: