What do you understand about database?
A database is an organized collection of structured information, or data, typically stored electronically in a computer system. The data can then be easily accessed, managed, modified, updated, controlled, and organized. Most databases use structured query language (SQL) for writing and querying data.
What are the different types of relationships in relational database?
There are three types of relationships between the data you are likely to encounter at this stage in the design: one-to-one, one-to-many, and many-to-many. To be able to identify these relationships, you need to examine the data and have an understanding of what business rules apply to the data and tables.
How is a relationship defined in a relational database?
Each table has a primary key which uniquely identifies each record in the table, and which cannot be null. For each relationship table A has to another table, it requires a foreign key as an attribute in table A to define that relationship. This is how we define the relations between the data in a 1-to-N relationship in a relational database.
How to design database based on your requirements?
Let’s design a database based on our own requirements! The first thing to think about when creating a database is what we want it for. This may seem obvious, but is worth stating explicitly. Different requirements will lead to different information structures, relationships, designs and implementations.
How to create and query a relational database?
This is part 1 of a 3-part series taking you through the process of designing, coding, implementing and querying a relational database, starting from zero. See part 2 (Coding and Implementing a Relational Database using MySQL) here, and part 3 (Data Analysis in MySQL — Operators, Joins and More in Relational Databases) here.
How are updates performed in a relational database?
Four basic update operations performed on relational database model are Insert, update, delete and select. Insert is used to insert data into the relation Delete is used to delete tuples from the table.