GROUPING_ID (Transact-SQL)

No código a seguir, para retornar somente as linhas com uma contagem de funcionários por título, remova os caracteres de comentário de HAVING GROUPING_ID(D.Name, E.JobTitle); = 0. Para retornar somente as linhas com uma contagem de funcionários por departamento, remova os caracteres de comentário de HAVING GROUPING_ID(D.Name, E.JobTitle) = 1;.

USE AdventureWorks2008R2;
GO
SELECT D.Name
    ,E.JobTitle
    ,GROUPING_ID(D.Name, E.JobTitle) AS 'Grouping Level'
    ,COUNT(E.BusinessEntityID) AS N'Employee Count'
FROM HumanResources.Employee AS E
    INNER JOIN HumanResources.EmployeeDepartmentHistory AS DH
        ON E.BusinessEntityID = DH.BusinessEntityID
    INNER JOIN HumanResources.Department AS D
        ON D.DepartmentID = DH.DepartmentID     
WHERE DH.EndDate IS NULL
    AND D.DepartmentID IN (12,14)
GROUP BY ROLLUP(D.Name, E.JobTitle)
--HAVING GROUPING_ID(D.Name, E.JobTitle) = 0; --All titles
--HAVING GROUPING_ID(D.Name, E.JobTitle) = 1; --Group by Name;

Veja o conjunto dos resultados não filtrados:

No exemplo a seguir, GROUPING_ID() é usado para filtrar um conjunto de resultados que contém vários níveis de agrupamento por nível de agrupamento. Um código semelhante pode ser usado para criar uma exibição com vários níveis de agrupamento e um procedimento armazenado que chama a exibição passando um parâmetro para filtrá-la por nível de agrupamento.

USE AdventureWorks2008R2;
GO
DECLARE @Grouping nvarchar(50);
DECLARE @GroupingLevel smallint;
SET @Grouping = N'CountryRegionCode Total';

SELECT @GroupingLevel = (
    CASE @Grouping
        WHEN N'Grand Total'             THEN 15
        WHEN N'SalesPerson Total'       THEN 14
        WHEN N'Store Total'             THEN 13
        WHEN N'Store SalesPerson Total' THEN 12
        WHEN N'CountryRegionCode Total' THEN 11
        WHEN N'Group Total'             THEN 7
        ELSE N'Unknown'
    END);

SELECT 
    T.[Group]
    ,T.CountryRegionCode
    ,S.Name AS N'Store'
    ,(SELECT P.FirstName + ' ' + P.LastName 
        FROM Person.Person AS P 
        WHERE P.BusinessEntityID = H.SalesPersonID)
        AS N'Sales Person'
    ,SUM(TotalDue)AS N'TotalSold'
    ,CAST(GROUPING(T.[Group])AS char(1)) + 
        CAST(GROUPING(T.CountryRegionCode)AS char(1)) + 
        CAST(GROUPING(S.Name)AS char(1)) + 
        CAST(GROUPING(H.SalesPersonID)AS char(1)) 
        AS N'GROUPING base-2'
    ,GROUPING_ID((T.[Group])
        ,(T.CountryRegionCode),(S.Name),(H.SalesPersonID)
        ) AS N'GROUPING_ID'
    ,CASE 
        WHEN GROUPING_ID(
            (T.[Group]),(T.CountryRegionCode)
            ,(S.Name),(H.SalesPersonID)
            ) = 15 THEN N'Grand Total'
        WHEN GROUPING_ID(
            (T.[Group]),(T.CountryRegionCode)
            ,(S.Name),(H.SalesPersonID)
            ) = 14 THEN N'SalesPerson Total'
        WHEN GROUPING_ID(
            (T.[Group]),(T.CountryRegionCode)
            ,(S.Name),(H.SalesPersonID)
            ) = 13 THEN N'Store Total'
        WHEN GROUPING_ID(
            (T.[Group]),(T.CountryRegionCode)
            ,(S.Name),(H.SalesPersonID)
            ) = 12 THEN N'Store SalesPerson Total'
        WHEN GROUPING_ID(
            (T.[Group]),(T.CountryRegionCode)
            ,(S.Name),(H.SalesPersonID)
            ) = 11 THEN N'CountryRegionCode Total'
        WHEN GROUPING_ID(
            (T.[Group]),(T.CountryRegionCode)
            ,(S.Name),(H.SalesPersonID)
            ) =  7 THEN N'Group Total'
        ELSE N'Error'
        END AS N'Level'
FROM Sales.Customer AS C
    INNER JOIN Sales.Store AS S
        ON C.StoreID  = S.BusinessEntityID 
    INNER JOIN Sales.SalesTerritory AS T
        ON C.TerritoryID  = T.TerritoryID 
    INNER JOIN Sales.SalesOrderHeader AS H
        ON C.CustomerID = H.CustomerID
GROUP BY GROUPING SETS ((S.Name,H.SalesPersonID)
    ,(H.SalesPersonID),(S.Name)
    ,(T.[Group]),(T.CountryRegionCode),()
    )
HAVING GROUPING_ID(
    (T.[Group]),(T.CountryRegionCode),(S.Name),(H.SalesPersonID)
    ) = @GroupingLevel
ORDER BY 
    GROUPING_ID(S.Name,H.SalesPersonID),GROUPING_ID((T.[Group])
    ,(T.CountryRegionCode)
    ,(S.Name)
    ,(H.SalesPersonID))ASC;

Neste exemplo, todos os níveis de agrupamento não aparecem como no exemplo de CUBE a seguir. Se a ordem das colunas na lista ROLLUP for alterada, os valores de nível na coluna Grouping Level também terão de ser alterados.

USE AdventureWorks2008R2;
GO
SELECT DATEPART(yyyy,OrderDate) AS N'Year'
    ,DATEPART(mm,OrderDate) AS N'Month'
    ,DATEPART(dd,OrderDate) AS N'Day'
    ,SUM(TotalDue) AS N'Total Due'
    ,CAST(GROUPING(DATEPART(dd,OrderDate))AS char(1)) + 
        CAST(GROUPING(DATEPART(mm,OrderDate))AS char(1)) + 
        CAST(GROUPING(DATEPART(yyyy,OrderDate))AS char(1)) 
     AS N'Bit Vector(base-2)'
    ,GROUPING_ID(DATEPART(yyyy,OrderDate)
        ,DATEPART(mm,OrderDate)
        ,DATEPART(dd,OrderDate)) 
        AS N'Integer Equivalent'
    ,CASE
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 0 THEN N'Year Month Day'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 1 THEN N'Year Month'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 2 THEN N'not used'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 3 THEN N'Year'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 4 THEN N'not used'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 5 THEN N'not used'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 6 THEN N'not used'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 7 THEN N'Grand Total'
    ELSE N'Error'
    END AS N'Grouping Level'
FROM Sales.SalesOrderHeader
WHERE DATEPART(yyyy,OrderDate) IN(N'2007',N'2008')
    AND DATEPART(mm,OrderDate) IN(1,2)
    AND DATEPART(dd,OrderDate) IN(1,2)
GROUP BY ROLLUP(DATEPART(yyyy,OrderDate)
        ,DATEPART(mm,OrderDate)
        ,DATEPART(dd,OrderDate))
ORDER BY GROUPING_ID(DATEPART(mm,OrderDate)
    ,DATEPART(yyyy,OrderDate)
    ,DATEPART(dd,OrderDate)
    )
    ,DATEPART(yyyy,OrderDate)
    ,DATEPART(mm,OrderDate)
    ,DATEPART(dd,OrderDate);

Veja um conjunto parcial de resultados.

Neste exemplo, a função GROUPING_ID() é usada para criar um valor para cada linha na coluna Grouping Level para identificar o nível de agrupamento.

Diferentemente de ROLLUP no exemplo anterior, CUBE gera a saída de todos os níveis de agrupamento. Se a ordem das colunas na lista CUBE for alterada, os valores de nível na coluna Grouping Level também terão de ser alterados.

USE AdventureWorks2008R2;
GO
SELECT DATEPART(yyyy,OrderDate) AS N'Year'
    ,DATEPART(mm,OrderDate) AS N'Month'
    ,DATEPART(dd,OrderDate) AS N'Day'
    ,SUM(TotalDue) AS N'Total Due'
    ,CAST(GROUPING(DATEPART(dd,OrderDate))AS char(1)) + 
        CAST(GROUPING(DATEPART(mm,OrderDate))AS char(1)) + 
        CAST(GROUPING(DATEPART(yyyy,OrderDate))AS char(1)) 
        AS N'Bit Vector(base-2)'
    ,GROUPING_ID(DATEPART(yyyy,OrderDate)
        ,DATEPART(mm,OrderDate)
        ,DATEPART(dd,OrderDate)) 
        AS N'Integer Equivalent'
    ,CASE
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate)
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 0 THEN N'Year Month Day'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate) 
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 1 THEN N'Year Month'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate) 
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 2 THEN N'Year Day'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate) 
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 3 THEN N'Year'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate) 
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 4 THEN N'Month Day'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate) 
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 5 THEN N'Month'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate) 
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 6 THEN N'Day'
        WHEN GROUPING_ID(DATEPART(yyyy,OrderDate) 
            ,DATEPART(mm,OrderDate),DATEPART(dd,OrderDate)
            ) = 7 THEN N'Grand Total'
    ELSE N'Error'
    END AS N'Grouping Level'
FROM Sales.SalesOrderHeader
WHERE DATEPART(yyyy,OrderDate) IN(N'2007',N'2008')
    AND DATEPART(mm,OrderDate) IN(1,2)
    AND DATEPART(dd,OrderDate) IN(1,2)
GROUP BY CUBE(DATEPART(yyyy,OrderDate)
    ,DATEPART(mm,OrderDate)
    ,DATEPART(dd,OrderDate))
ORDER BY GROUPING_ID(DATEPART(yyyy,OrderDate)
    ,DATEPART(mm,OrderDate)
    ,DATEPART(dd,OrderDate)
    )
    ,DATEPART(yyyy,OrderDate)
    ,DATEPART(mm,OrderDate)
    ,DATEPART(dd,OrderDate);

Veja um conjunto parcial de resultados.