Introduction to Database Triggers with PostgreSQL

Introduction to Database Triggers with PostgreSQL, available at $19.99, has an average rating of 4, with 16 lectures, based on 1 reviews, and has 611 subscribers.

You will learn about Install PostgreSQL on Windows Install PostgreSQL on Macs Installing PgAdmin on Macs Connect to PostgreSQL with PgAdmin Restore a sample database Create a new table Populate a table Creating a trigger Manage Triggers This course is ideal for individuals who are Beginners to creating Triggers It is particularly useful for Beginners to creating Triggers.

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Summary

Title: Introduction to Database Triggers with PostgreSQL

Price: $19.99

Average Rating: 4

Number of Lectures: 16

Number of Published Lectures: 16

Number of Curriculum Items: 16

Number of Published Curriculum Objects: 16

Original Price: $19.99

Quality Status: approved

Status: Live

What You Will Learn

Install PostgreSQL on Windows
Install PostgreSQL on Macs
Installing PgAdmin on Macs
Connect to PostgreSQL with PgAdmin
Restore a sample database
Create a new table
Populate a table
Creating a trigger
Manage Triggers

Who Should Attend

Beginners to creating Triggers

Target Audiences

Beginners to creating Triggers

A database trigger is procedural code that is automatically executed in response to certain events on a particular table or view in a database. The trigger is mostly used for maintaining the integrity of the information on the database. For example, when a new record (representing a new worker) is added to the employees table, new records should also be created in the tables of the taxes, vacations and salaries. Triggers can also be used to log historical data, for example to keep track of employees’ previous salaries.

A PostgreSQL trigger is a function invoked automatically whenever an event associated with a table occurs. An event could be any of the following: INSERT, UPDATE, DELETE or TRUNCATE.

A trigger is a special user-defined function that binds to a table. To create a new trigger, you must define a trigger function first, and then bind this trigger function to a table. The difference between a trigger and a user-defined function is that a trigger is automatically invoked when an event occurs.

PostgreSQL provides two main types of triggers: row and statement level triggers. The differences between the two are how many times the trigger is invoked and at what time. For example, if you issue an UPDATE statement that affects 20 rows, the row level trigger will be invoked 20 times, while the statement level trigger will be invoked 1 time.

You can specify whether the trigger is invoked before or after an event. If the trigger is invoked before an event, it can skip the operation for the current row or even change the row being updated or inserted. In case the trigger is invoked after the event, all changes are available to the trigger.

Course Curriculum

Chapter 1: PostgreSQL Setup

Lecture 1: Introduction

Lecture 2: What is PostgreSQL

Lecture 3: Installing PostgreSQL on Windows

Lecture 4: Installing PostgreSQL on Macs

Lecture 5: Installing PgAdmin on Macs

Lecture 6: Connecting to PostgreSQL with PgAdmin

Lecture 7: Restore a sample database

Lecture 8: Create a new table

Lecture 9: Populate a table

Lecture 10: Query Table

Chapter 2: Database Triggers

Lecture 1: Overview of PostgreSQL Database Triggers

Lecture 2: What are Triggers

Lecture 3: Creating your first trigger : Part 1

Lecture 4: Creating your first trigger : Part 2

Lecture 5: Creating your first trigger : Part 3

Lecture 6: Managing Triggers

Instructors

Bluelime Learning Solutions
Making Learning Simple

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