MS SQL Server サンプルデータの AdventureWorksDW2019 スキーマを使って T-SQL を覚えるメモ。
ファクトテーブルの dbo.FactInternetSales と関連ディメンションテーブルを結合してカテゴリ別の売上データを抽出するクエリ
with t1 as ( SELECT s.[ProductKey], s.[CustomerKey], d.[FullDateAlternateKey], s.[SalesOrderNumber], s.[SalesOrderLineNumber], s.[OrderQuantity] * s.[UnitPrice] as revenue, pc.[EnglishProductCategoryName] as category, psc.[EnglishProductSubcategoryName] as subcategory, p.[EnglishProductName] as productname FROM [dbo].[FactInternetSales] as s inner join [dbo].[DimDate] as d on s.[OrderDateKey] = d.[DateKey] inner join [dbo].[DimProduct] as p on s.[ProductKey] = p.[ProductKey] left join [dbo].[DimProductSubcategory] as psc on p.[ProductSubcategoryKey] = psc.[ProductSubcategoryKey] left join [dbo].[DimProductCategory] as pc on psc.[ProductCategoryKey] = pc.[ProductCategoryKey] where 1 = 1 and s.[OrderDate] between '2013-01-01' and '2013-12-31' ) select coalesce(t1.[category], 'all') as category, coalesce(t1.[subcategory], 'all') as subcategory, sum(t1.[revenue]) as revenue from t1 group by rollup(t1.[category], t1.[subcategory]);
結果はこうなる。
GROUP BY ROLLUP 関数が超便利。
PowerBI で表示するとこうなる。
参考図書
ビッグデータ分析・活用のためのSQLレシピ
SQL Server 2016の教科書 開発編