Question

我有3张桌子：

第一个Week表
第二个Reference表
第三张表Inner表

但我对内表有些问题。

我想在内部表中添加一些与Final_table相同的行并为内部表中不存在的行添加0

我需要在SQL中进行查询才能完成。

请注意我有内部表格，我不是从tblWeek和Reference表创建的，但我可以使用它们

Final_table

                Week    RefNumber   Value   
RefNumber       01.08.16    100 15  
100             01.08.16    200 3   
200             01.08.16    300 0   
300             08.08.16    100 8   
                08.08.16    200 0   
                08.08.16    300 0   
                16.08.16    100 0   
                16.08.16    200 0   
                16.08.16    300 7

Full_tbl

Week    RefNumber   Value                   
01.08.16    100 15                  
01.08.16    200 3                   
08.08.16    100 8                   
16.08.16    200 7

enter image description here

Answer 1

您可以使用Right Join和Cross Join

来实现这一目标

SELECT X.WEEK,X.RefNumber,ISNULL(T.Value,0) AS Value
FROM [Full_Tbl] T
    RIGHT JOIN
        (SELECT  WEEK,RefNumber
            FROM [WEEK] 
         CROSS JOIN [RefNumber] ) X
         ON X.[WEEK]=T.[Week] AND X.[RefNumber] = T.[RefNumber]
ORDER BY X.[WEEK]

Answer 2

我希望我的问题正确（主要来自附图）。

在这里，这应该有效：

SELECT f.week, f.refnumber, (CASE WHEN f.value IS NULL THEN 0 ELSE f.value END) as value
FROM Full_tbl f
RIGHT JOIN refnumber on  f.refnumber = refnumber.refnumber

基本上我们做的是：

我们从“refnumber”表中获取所有行（即RIGHT JOIN）。
如果与此重新编号相关联的值为NUL1，则使用大小写为0。

Answer 3

我们可union all cross join使用where not exists()获取Week和RefNumber中inner_table和select [Week], RefNumber, [Value] from inner_table union all select [Week], RefNumber, [Value]=0 from [Week] w cross join RefNumber r where not exists ( select 1 from inner_table as i where i.[Week] = w.[Week] and i.RefNumber = r.RefNumber )的组合SELECT * FROM orders JOIN products ON orders.productid = products.productid ORDER BY userid

SELECT * FROM orders 
JOIN products ON orders.productid = products.productid
WHERE userid = 555

为不存在0值的行创建内部联接

3 个答案: