Showing posts from April, 2020

2 Basic SQL Syntax and Commands

Basic SQL Syntax and Commands SQL (Structured Query Language) is a powerful language used to manage and manipulate data in relational databases. Whether you're a beginner or an experienced developer, understanding the basics of SQL syntax and commands is essential to working with databases. The SELECT Statement The SELECT statement is used to retrieve data from a database. It allows you to specify the columns and rows that you want to retrieve, and can also be used to perform calculations or manipulate data. The basic syntax of a SELECT statement is as follows: SELECT column1, column2, ... FROM table_name; For example, let's say you have a table called "fruits" with columns for "name", "color", and "quantity". To retrieve all the rows and columns from this table, you would use the following SELECT statement: SELECT * FROM fruits; You can also use the WHERE clause to filter the data based on specific criteria. For

1 Introduction to SQL and Relational Databases.

Introduction to SQL and Relational Databases Introduction to SQL and Relational Databases Are you ready to learn about SQL and relational databases? Don't worry, it's not as complicated as it sounds. In fact, SQL is like the language of databases and relational databases are like the city you live in. Let me explain. Imagine you're living in a big city with lots of people, buildings, and places to go. You need a way to keep track of all the information about the city - the people, the buildings, the businesses, and so on. This is where a database comes in handy. Now, imagine that you're a mayor of this big city, and you want to keep track of all the residents. You need a place to store information about each resident, such as their name, age, and address. This is where a table in a relational database comes in. In SQL, a table is like a spreadsheet with rows and columns. Each row represents a record (or a person, in this case) and each column