The asterisk wildcard character (*) refers to “ all” and selects all the rows and columns. Using this SELECT statement, the query selects all the data from all the columns in the customer’s table and returns data like so: Source: Database Guide Here’s what an example query looks like: SELECT * FROM customers Using SQL, we can interact with the database by writing queries. Here’s what a basic relational database looks like: Source SQL is used today to store, retrieve, and manipulate data within relational databases.
It is a language for relational database management systems. SQL stands for Structured Query Language. This article will walk you through a hackable cheatsheet to get you up and running with SQL quickly. With more than 2.5 exabytes of data generated every day, it comes as no surprise that this data needs to be stored somewhere where we can access it when we need it. I’m an AI researcher, so one of the main things I deal with is data.
