Today’s learning covered a mix of automation concepts and SQL interview prep.
🔹 What I Learned Today
1. What is a Cron Job?
- A cron job is like a reminder system for computers.
- It allows us to schedule tasks (scripts, queries, reports, etc.) at fixed times, dates, or intervals automatically.
- Example: Running a daily SQL backup at 2 AM without manual effort.
👉 Why we use it?
To save time, reduce manual errors, and make processes repeatable.
👉 How to use it?
- In Linux, cron jobs are managed using the
crontabcommand. - Example:
0 2 * * * /usr/bin/python3 backup.py
(This runs backup.py every day at 2 AM).
💡 Analogy: Think of cron jobs like setting an alarm clock for your computer to do tasks automatically.
🔹 SQL Interview Preparation
I also prepared 5 SQL interview questions today. On average, in an interview, we should spend around 30–40 seconds per answer (clear, short, with one real-world example).
Example Questions:
- What is SQL?
- What is the difference between Primary Key and Unique Key?
- What is a Foreign Key?
- How does GROUP BY work?
- What is the use of HAVING clause?
👉 My plan is to speak ~30 seconds per answer, using real-world scenarios like e-commerce orders, automobile data, and employee databases.
🔹 SQL Project in My Batch
Today in my batch, one of my friends explained their project in SQL on the Automobile Domain.
- They created tables for Car Models, Customers, and Sales.
- Queries included finding top-selling car models, filtering sales by year, and identifying customers who purchased more than one car.
- It was a great real-world project showing how SQL powers data analysis in the automobile industry.
This inspired me to think about how data analytics is applied in different sectors like healthcare, finance, and retail.
✨ Reflection
- Cron jobs reminded me how important automation is in real-world analytics.
- Interview prep is building my confidence in SQL fundamentals.
- Seeing the automobile SQL project gave me new ideas for applying concepts in practical domains.
Top comments (0)