Basic SQL - Smart Tutorials

Joins in SQL

In real-world databases, data is not stored in one big table. Instead: To generate meaningful reports, we must combine data

When working with business data, sometimes one query is not enough. You may want to ask questions like: To answer

When working with business data, we rarely want one total number. We want: This is done using GROUP BY. What

When working with data, we rarely want individual rows.We usually want answers like: These calculations are done using Aggregate Functions.

If SQL were a car, SELECT would be the steering wheel.Without it, you can’t explore data, analyze reports, or build

When working as a Data Analyst or MIS professional, you will often need to: That’s where the DELETE statement comes

When you start working on real-world databases, one thing becomes clear: 👉 Data structure keeps changing. And this is where

Imagine this situation… You open a production database and find: You cannot delete everything. You must correct it. That is

You can create the most perfect database in the world… But without data, it is useless 😄 In this article,

Imagine you just joined a growing FMCG company as a Data Analyst. The company sells: They have: But there is

When you create a table in SQL, you must tell the database: 👉 “What type of data will be stored

Imagine this… You open an Excel file and see 50,000 rows of sales data. No structure.No connection.Same customer name written