Claude AI for Consultants: From Beginner to Pro

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.

You should learn this language! Python is one of the fastest growing languages, it's even renowned as the language of the decade. You can use Python on any operating system to build whatever you like, including but not limited to GUI Applications, Web Applications, and Console Applications. I'll teach you how this seemingly strange language is actually quite simple. We cover the fundamentals to writing Python code from Syntax, Datatypes, Operators, and Looping. We'll even take a look into 3rd party package management!

Course overviewUntyped programs are often prone to errors, runtime exceptions, and can make debugging much harder. That’s why many production languages implement a static typechecker — an extra module, which is aimed to increase programs safety and make development simpler.Type checking or type inference? What is Type theory and Type judgements? Is my language weakly or strongly typed? And how am I actually going to implement a typechecker?There are so many questions when it comes to implementing this module. If you’ve been asking those questions in implementing your programming language, or just want to understand how typeckechers work under the hood, on a hands-on practical implementation, this course is for you.---------------------------------------------------------Often related books on Type theory and type judgements go to theoretical aspects viewing types as mathematical sets, not explaining how actually to build a practical typechecker. I believe we should be able to build and understand a typechecker for a full programming language, end-to-end, in 2-4 hours — with a content going straight to the point, showed in live coding sessions as pair-programming and described in a comprehensible way.In the Building a Typechecker from scratch class we focus specifically on a static typechecker, and build a similar to TypeScript, Java, etc. We slightly touch Type theory and already since the first lecture go into the practical implementation.Implementing a typechecker would also increase your engineering level, as it touches several aspects of data structures and algorithms.PrerequisitesAn optional prerequisite for this class is the Building an Interpreter from scratch (aka Essentials of Interpretation) course, where we build

JavaScript Mastery: Theory Application course. Designed for beginners and experienced developers alike, this course covers fundamental principles, advanced programming concepts, and real-world applications to help you become a proficient JavaScript developer.If you want to start learning Javascript or to apply HTML5, CSS3 and Javascript in a project to program or you already have some basic knowledge, then you are in the right place. This course gives you a chance to take your knowledge to the next level. You will start from very basics and learn to apply the skills in two different projects (Quiz and Game).Get certified in Javascript theory and application in projects. Please send me your email in my inbox and I will forward you your certification after your assessment. Please give at least few weeks to a month to receive your certificate via email as it is a popular course.You will learn about the very basics of this language, like how to write JavaScript, what kind of syntax it has. You will learn the following topics on Javascript theory: Javascript VariablesJavascript Data TypeJavascript FunctionJavascript Function ParameterJavascript ReturnJavascript ScopeJavascript Alert Confirm PromptJavascript ObjectsJavascript ArraysJavascript If Else statementJavascript Switch CaseJavascript Maths OperatorsJavascript Logical Operators(More topics will be added in the future) This is a fun, practical project based course for all skill levels. The projects in this course are designed to get you building things using HTML5, CSS JavaScript with no frameworks or libraries. Every project is built from scratch and has some kind of dynamic functionality.Although this is a theoretical and project based course, I will still be explaining everything

We will learn the complete idea to develop a CodeIgniter 4 RESTful APIs Development Using Shield Authentication. Basic Experience in CodeIgniter programming required like working of MVC. Learn practical skills of APIs Development in CodeIgniter 4 with mysql database driver.Begin your journey of RESTful APIs Development Using Shield Authentication with MySQL database driver here.If you have just decided to learn CodeIgniter 4 APIs development Using Authentication then you have made the right choice, so take a breath. RESTful APIs Development is very easy to learn which means that you will be through the basics and on to writing standard code to create RESTful Web APIs in a very short time.This course is a step by step guide through the CodeIgniter 4 development with MySQL programming language. You will go from a beginner level to creating your own web services.These are things you will learn step by step –Basics of CodeIgniter 4.Concept of Route, Controller, Migration, Seeders, Filters, Route Group Namespace.Complete concept of Authentication in CodeIgniter 4.API Development without using authentication.API development guide with live code session with Shield.API development plans while creating application structure.About Shield basics and its structure.API Error handling by using filters.About Response HTTP CodeDifference between API Development using Authentication and without any authentication.API Development Configuration.Shield package Installation with Complete details.About Filter and their use.Process of API and their strategy of development.This course is for every level. For beginners, it will be very perfect to enroll and learn development in very easy steps with detailed concept.

C# is the most popular programming language used to build applications using Microsoft's .NET framework. In this course you will master the fundamentals of the C# programming language quickly and easily. This course is created by software expert Stefanos Arapakis who builds real world applications in the demanding workplace. With over 10 years practical experience, Stefanos will show you the absolute fundamentals you need to know to start your career as a professional C# programmer. This course includes 32 high definition videos, and each video is optimized to teach quickly, clearly, and easily. With each video you will also be able to download the C# source code to run on your own PC. Take the first step and start your programming career now.