5. Understanding Advanced Database Programming Objects and Error Handling | SQL Server 2014 Development Essentials

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SQL Server 2014 Development Essentials

By : A. Masood-Al-Farooq

3 (3)

SQL Server 2014 Development Essentials

3 (3)

By: A. Masood-Al-Farooq

Overview of this book

This book is an easy-to-follow, comprehensive guide that is full of hands-on examples, which you can follow to successfully design, build, and deploy mission-critical database applications with SQL Server 2014. If you are a database developer, architect, or administrator who wants to learn how to design, implement, and deliver a successful database solution with SQL Server 2014, then this book is for you. Existing users of Microsoft SQL Server will also benefit from this book as they will learn what's new in the latest version.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Microsoft SQL Server Database Design Principles

1. Microsoft SQL Server Database Design Principles

Database design

Table design

Relationships

Data integrity

The basics of data normalization

The SQL Server database architecture

The importance of choosing the appropriate data type

Summary

2. Understanding DDL and DCL Statements in SQL Server

2. Understanding DDL and DCL Statements in SQL Server

Understanding the DDL, DCL, and DML language elements

Understanding the purpose of SQL Server 2014 system databases

An overview of database recovery models

Creating and modifying databases

Creating and managing database schemas

Creating and managing tables

Grant, deny, and revoke permissions to securables

Summary

3. Data Retrieval Using Transact-SQL Statements

3. Data Retrieval Using Transact-SQL Statements

Understanding Transact-SQL SELECT, FROM, and WHERE clauses

Using T-SQL functions in the query

Multiple table queries using UNION, EXCEPT, INTERSECT, and JOINs

Subqueries

Common Table Expressions

Organizing and grouping data

Using the Transact-SQL analytic window functions

Summary

4. Data Modification with SQL Server Transact-SQL Statements

4. Data Modification with SQL Server Transact-SQL Statements

Inserting data into SQL Server database tables

Updating data in SQL Server database tables

Deleting data from SQL Server database tables

Using the MERGE statement

The TRUNCATE TABLE statement

The SELECT INTO statement

Summary

5. Understanding Advanced Database Programming Objects and Error Handling

5. Understanding Advanced Database Programming Objects and Error Handling

Creating and using variables

Control-of-flow keywords

Creating and using views

Creating and using stored procedures

Creating and using user-defined functions

Creating and using triggers

Handling Transact-SQL errors

Summary

6. Performance Basics

6. Performance Basics

Components of SQL Server Database Engine

The SQL Server 2014 in-memory OLTP engine

Indexes

Query optimization statistics

The fundamentals of transactions

SQL Server 2014 tools for monitoring and troubleshooting SQL Server performance

Summary

Index

Index

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Creating and using variables

Like other programming languages, the SQL Server Transact-SQL language also allows temporary storage in the form of variables. Variables are stored in memory and are accessible only from the batch or stored procedure, or the function in which they are declared. There are three types of variables you can create in SQL Server: local variables (based on system or user-defined data types), cursor variables (to store a server-side cursor), and table variables (that is, structured like a user-defined table).

We can declare a variable as a standard variable in Transact-SQL by prefixing it with the @ symbol. We use the DECLARE statement to declare a variable or multiple variables.

Creating a local variable

The basic syntax for creating a local variable is as follows:

DECLARE @variable_name [AS] data_type

By default, all local variables are initialized as NULL. We can assign a value to a local variable in one of the following three ways:

By using the SET keyword, which is the...

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