(SQL Tutorials for Citizen Data Scientist) SQL Constraints In this tutorial you will learn how to use SQL constraints. What is Constraint? A constraint is simply a restriction placed on one or more columns of a table to limit the type of values that can be stored in that column. Constraints provide a standard mechanism to …
(SQL Tutorials for Citizen Data Scientist) SQL CREATE TABLE Statement In this tutorial you will learn how to create a table inside the database using SQL. Creating a Table In the previous chapter we have learned how to create a database on the database server. Now it’s time to create some tables inside our database that will …
(SQL Tutorials for Citizen Data Scientist) SQL CREATE DATABASE Statement In this tutorial you will learn how to create database in a relational database management system like, MySQL, SQL Server, etc. using SQL. Creating a Database Before doing anything with the data we must need to create a database first. We’re assuming that you already have a …
(SQL Tutorials for Citizen Data Scientist) SQL Syntax The syntax of SQL is governed by the American National Standards Institute (ANSI) and the International Organization for Standardization (ISO). SQL Statements SQL statements are very simple and straightforward like plain English but with specific syntax. An SQL statement is composed of a sequence of keywords, identifiers, etc. …