Question

我想将两个查询合并为垂直，因此通常不使用union参数。

select Code, Name, Category, SubCategory, p.Brand, Model, Price, Currency,
Unit, Template, F1, F2,P1, P2, DiscountPercent as PrivateDiscount from Products as p 
left join ProductTemplates as pt on pt.TemplateName=p.Template
left join Discounts as d on d.Brand = p.Brand and d.Status=1 and d.CustomerID='1198' and d.DiscountType=0 

select DiscountPercent as PublicDiscount from Products as p 
left join ProductTemplates as pt on pt.TemplateName=p.Template
left join Discounts as d on d.Brand = p.Brand and d.Status=1 and d.DiscountType=1

出：QUERY1

列名称：|代码|名称|类别|品牌| PrivateDiscount |

2.row _____：| scf3 | adcdd | affcdcddd | assfdd | ％6 |

出：QUERY2

列名称：| PublicDiscount |

1.row _____：| ％2 |

2.row _____：| ％3 |

我想要这个结果：

列名称：|代码|名称|类别|品牌| PrivateDiscount | PublicDiscount |

1.row _____：| ssff3 | adcdd | affcdcddd | assfdd | ％6 | ________ | ％2 |

2.row _____：| scf3f | adcdd | affcdcddd | assfdd | ％6 | ________ | ％3 |

因此，应该是列＆＃34; PublicDiscount＆＃34;，在列＆＃34; PrivateDiscount＆＃34;旁边。怎么可以呢？

Answer 1

只需加入折扣表两次：

select 
  Code, Name, Category, SubCategory, p.Brand, Model, Price, Currency,
  Unit, Template, F1, F2,P1, P2, 
  privd.DiscountPercent as PrivateDiscount,
  pupld.DiscountPercent as PublicDiscount
from Products as p 
left join ProductTemplates as pt on pt.TemplateName=p.Template
left join Discounts as privd on privd.Brand = p.Brand and privd.Status=1 and privd.CustomerID='1198' and privd.DiscountType=0 
left join Discounts as pupld on pupld.Brand = p.Brand and pupld.Status=1 and pupld.DiscountType=1;

Answer 2

加入这样的查询： [请注意，我使用ProductId作为主键，请将其替换为Products table]的实际主键字段名称

SELECT Code, Name, Category, SubCategory, p.Brand, Model, Price, 
Currency, Unit, Template, F1, F2,P1, P2, PrivateDiscount, PublicDiscount
FROM
(
    SELECT Code, Name, Category, SubCategory, p.Brand, Model, Price, Currency,
    Unit, Template, F1, F2,P1, P2, DiscountPercent as PrivateDiscount, p.ProductId from Products as p 
    left join ProductTemplates as pt on pt.TemplateName=p.Template
    left join Discounts as d on d.Brand = p.Brand and d.Status=1 and d.CustomerID='1198' and d.DiscountType=0 
) as tbl1
INNER JOIN 
(
    SELECT DiscountPercent as PublicDiscount, p.ProductId from Products as p 
    left join ProductTemplates as pt on pt.TemplateName=p.Template
    left join Discounts as d on d.Brand = p.Brand and d.Status=1 and d.DiscountType=1
) as tbl2
ON tbl1.ProductId=tbl2.ProductId;

希望这会有效，谢谢。

Answer 3

我不太确定，但在我看来，你想在最终结果集中获得与公共折扣一样多的行。这将是CROSS JOIN的典型用法：

select  Code,
        Name,
        Category,
        SubCategory,
        p.Brand,
        Model,
        Price,
        Currency,
        Unit,
        Template,
        F1,
        F2,
        P1,
        P2,
        DiscountPercent as PrivateDiscount,
        p.PublicDiscount
from    Products as p
left join ProductTemplates as pt
        on pt.TemplateName = p.Template
left join Discounts as d
        on d.Brand = p.Brand
           and d.Status = 1
           and d.CustomerID = '1198'
           and d.DiscountType = 0
cross join (
             select DiscountPercent as PublicDiscount
             from   Products as p
             left join ProductTemplates as pt
                    on pt.TemplateName = p.Template
             left join Discounts as d
                    on d.Brand = p.Brand
                       and d.Status = 1
                       and d.DiscountType = 1
            ) as p

联合两个查询但不是水平垂直

3 个答案: