sql server2012代码

### SQL Server 2012 Code Examples and Programming Guide

For creating a database structure specifically tailored for Microsoft SQL Server, including defining tables with appropriate data types such as `job_id` being of type `VARCHAR`, `salary` as `NUMBER`, or more accurately in SQL Server context using `NVARCHAR` and `DECIMAL` respectively to ensure compatibility and performance optimization[^3]. Below is an example demonstrating how one might define a simple table within SQL Server 2012:

CREATE TABLE Employees (
    EmployeeID INT IDENTITY(1,1) PRIMARY KEY,
    FirstName NVARCHAR(50),
    LastName NVARCHAR(50),
    JobTitle NVARCHAR(50),
    HireDate DATE,
    Salary DECIMAL(18, 4),
    CommissionPct DECIMAL(5, 2)
);

When it comes to executing complex operations that involve capturing multiple outputs from procedures or functions which cannot be directly achieved through T-SQL alone due to its limitations on handling collections efficiently, developers often resort to implementing these functionalities at the application level using languages like C# within the .NET framework environment. This approach leverages the strengths of both platforms while adhering to best practices recommended by industry experts[^2].

However, when working strictly within SQL Server 2012's capabilities without involving external applications, stored procedures can encapsulate logic requiring multi-step processes or returning several result sets. Here’s an illustration of declaring variables inside a procedure body along with performing basic insertions into previously created tables:

DECLARE @EmployeeName NVARCHAR(100);

SET @EmployeeName = 'John Doe';

INSERT INTO Employees (FirstName, LastName, JobTitle, HireDate, Salary, CommissionPct)
VALUES ('John', 'Doe', 'Sales Representative', GETDATE(), 75000.00, 0.05);

Additionally, triggers offer another powerful feature available since earlier versions up until SQL Server 2012 allowing automatic execution of actions based upon certain events happening either before or after changes occur against specified objects.

--related questions--

1. How does one optimize queries written for SQL Server 2012?
2. What are some common pitfalls encountered during migration projects targeting SQL Server 2012?
3. Can you provide guidance on securing databases running under SQL Server 2012 environments?
4. In what scenarios would integrating Entity Framework ORM make sense over traditional ADO.NET approaches when developing applications intended for use with SQL Server 2012?