SQL(Structured Query Language) Road Map for beginners

How can I learn SQL all over again if I were to start over? During your early days of learning you find yourself always in a dilemma of where to start learning SQL, What resources best suites your learning journey, What is the correct way to learn SQL …


This content originally appeared on DEV Community and was authored by allan-pg

How can I learn SQL all over again if I were to start over? During your early days of learning you find yourself always in a dilemma of where to start learning SQL, What resources best suites your learning journey, What is the correct way to learn SQL and it seems like you are in a state of confusion, right?

SQL learning

This is a comprehensive guide for beginners trying to set foot in the data industry. SQL(Structured Query Language) is a programming language used for manipulating relational databases

SQL Roadmap for beginners

1. Define database(s)

  • Define what a database is and the list out different types of databases(i.e relational and non relational databases)
  • Install and set up a database management system on your local machine

2. Basics of SQL

  • Define SQL and state features of SQL
  • What are the common Data Types mostly used in SQL
  • Understand basic syntax of SQL queries

3. Basic Commands in SQL

  • Select statement It is used to retrieve data from tables e.g 


select name, age
from students
  • Sorting and filtering data Using order by to sort data, where to filter data based on a condition and limit clause to specify number of to be returned by a query
  • Aggregate functions Learn to use MAX, MIN, AVERAGE, COUNT, SUM

  • Group by and Having Clause
    group data and understand how to filter grouped data

    4. Data manipulation

  • Insert
    add new records to a table

  • update
    Modify existing records in a table

  • delete
    remove records from a table in a database

    5. Database design

  • relationships
    understand how tables are related via primary and foreign keys, and the different types of relationships(i.e one to one, one to many)

  • Database normalisation
    Define normalisation and the different types of normalisation

    6. Advaced SQL Queries

  • Subqueries
    Writing a query inside another query

  • Joins
    Combining one or more rows of data from multiple tables using joins i.e(inner join, left join, right join, cross join)

  • Indexing
    Define indexing and the importance of indexes

    7. SQL functions and procedures

  • Functions
    What are functions and the inbuilt SQL functions

  • Triggers and procedures
    Define procedures and triggers, types of triggers and their applications

    8. Practice writing SQL

  • Hands on practice
    Login to chatgpt and ask chatgpt to produce dummy data to insert to your database
    Lastly, ask chatgpt to formulate questions to practice writing your SQL queries

  • Join an online community
    Join whatsapp, Linked in and SQL groups on social media.

Conclusion

By following this road map as beginner, you will build your skills in SQL. Ensure you have lots of practice so as to be proficient in SQL.


This content originally appeared on DEV Community and was authored by allan-pg


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