Condividi tramite

  • Articolo

Impostazione di limiti per le righe inserite utilizzando la parola chiave TOP

È possibile utilizzare la parola chiave TOP per limitare il numero di righe inserite.

Nell'esempio seguente viene creata la tabella NewEmployee, in cui vengono quindi inseriti i dati relativi agli indirizzi dei primi dieci dipendenti della tabella Employee. L'istruzione SELECT viene quindi eseguita per verificare il contenuto della tabella NewEmployee.

USE AdventureWorks2008R2;
GO
IF OBJECT_ID (N'HumanResources.NewEmployee', N'U') IS NOT NULL
    DROP TABLE HumanResources.NewEmployee;
GO
CREATE TABLE HumanResources.NewEmployee
(
    BusinessEntityID int NOT NULL,
    LastName nvarchar(50) NOT NULL,
    FirstName nvarchar(50) NOT NULL,
    PhoneNumber Phone NULL,
    AddressLine1 nvarchar(60) NOT NULL,
    City nvarchar(30) NOT NULL,
    State nchar(3) NOT NULL, 
    PostalCode nvarchar(15) NOT NULL,
    CurrentFlag Flag
);
GO
-- Insert 10 random rows into the table NewEmployee.
INSERT TOP (10) INTO HumanResources.NewEmployee 
    SELECT
       e.BusinessEntityID, c.LastName, c.FirstName, pp.PhoneNumber,
       a.AddressLine1, a.City, sp.StateProvinceCode, 
       a.PostalCode, e.CurrentFlag
    FROM HumanResources.Employee e
        INNER JOIN Person.BusinessEntityAddress AS bea
        ON e.BusinessEntityID = bea.BusinessEntityID
        INNER JOIN Person.Address AS a
        ON bea.AddressID = a.AddressID
        INNER JOIN Person.PersonPhone AS pp
        ON e.BusinessEntityID = pp.BusinessEntityID
        INNER JOIN Person.StateProvince AS sp
        ON a.StateProvinceID = sp.StateProvinceID
        INNER JOIN Person.Person as c
        ON e.BusinessEntityID = c.BusinessEntityID;
GO
SELECT  BusinessEntityID, LastName, FirstName, PhoneNumber,
        AddressLine1, City, State, PostalCode, CurrentFlag
FROM HumanResources.NewEmployee;
GO