如何向 GROUPING_ID 结果添加过滤器？

Question

我有以下疑问...

SELECT a.countryRegion, a.Stateprovince, SUM (soh.TotalDue) AS revenue,
CASE
WHEN GROUPING_ID(a.countryregion,a.stateprovince) = 0 THEN 'State/Province'
WHEN GROUPING_ID(a.countryregion,a.stateprovince) = 3 THEN 'Total'
WHEN GROUPING_ID(a.countryregion,a.stateprovince) = 1 THEN  'Country Total'
ELSE N'unknown'
END AS 'Level'
FROM saleslt.address AS a
JOIN saleslt.customeraddress AS ca
ON a.addressID = ca.addressID
JOIN saleslt.customer AS c
ON ca.customerID = c.customerID
JOIN salesLT.salesorderheader as soh 
ON c.customerID = soh.customerID
GROUP BY ROLLUP(a.countryregion, a.stateprovince)
ORDER BY  a.countryregion,a.stateprovince;

例如，如何让 Country 行包含值“United States Subtotal”，以及 state/province 行包含值“California Subtotal”？

该表包括大约 8 个不同的州/省和多个国家/地区。

Answer 1

您的 GROUP BY ROLLUP(a.countryregion, a.stateprovince) 语句应在小计之前返回具有 NULL 值的字段。

您可以将这些 NULL 值替换为“小计：”，方法是更改​​您的 select 语句，如下所示：

SELECT 
    coalesce(a.countryRegion,"Sub Total:") as countryRegion,
    coalesce(a.Stateprovince, "Sub Total:") as Stateprovince, .............

您可以格式化报表输出以消除重复的小计，或使用子查询来清除重复。

您可以查看 LEAD() 和 LAG() 窗口函数，以从上一行获取 countryRegion 和 StateProvince。