sql - 将主行添加到查询结果

Question

如何在 MSSQL 2005 中向查询结果添加主行。这是我需要返回的示例？

这是两个查询

查询 1

select product_id, sku from products

查询 2

select product_id, sku from childproducts

结果应该是这样的。（当然没有查询1）

    row 1: products.product_id, products.sku   (comes from one parent table)
    row 2: childproducts.product_id, childproducts.sku   (comes from child table)
    row 3: childproducts.product_id, childproducts.sku   (comes from child table)

Answer 1

您可以使用 UNION ALL 组合它们，例如

select 1 as Sorter, product_id, sku from products
UNION ALL
select 2, product_id, sku from childproducts
ORDER BY Sorter, product_id

请注意，我添加了 Sorter 列以使父集显示在子产品之前。如果您必须排除它，但仍按该顺序显示它们：

select product_id, sku
from (
    select 1 as Sorter, product_id, sku from products
    UNION ALL
    select 2, product_id, sku from childproducts
) X
ORDER BY Sorter, product_id

Answer 2

如果我理解正确，您想添加一个保持行顺序的主键，因此子项立即跟随父项。以下代码row_number()用于分配新 id：

select row_number() over (order by parentproduct_id, isparent desc) as newid,
       product_id, sku
from ((select product_id, sku, product_id as parentproduct_id, 1 as isparent
       from productions
      ) union all
      (select product_id, sku, parentproduct_id, 0 as isparent
       from childproducts
      )
     ) p

如果您实际上并不想要数据中的 id 而只是想要排序顺序，请添加以下内容：

order by parentproduct_id, isparent desc