Lecture 7: Conversion & Date Functions in SQL | Hands-On for Beginners in Testing & Analysis

Want to learn how to work with numbers, dates, and strings in SQL?
This video is your complete beginner-friendly guide to Conversion Functions and Date Functions in SQL — essential tools for database testing and data analysis.

This is the 8th video in the SQL Practical Series, where we explain every concept with clear, hands-on examples.

What You’ll Learn in This Video:
Conversion Functions:
• TO_CHAR() – Format numbers and dates as strings
• TO_DATE() – Convert strings into real date values
• TO_NUMBER() – Convert strings to numeric values

Date Functions:
• SYSDATE, CURRENT_DATE – Get the current system or session date
• ADD_MONTHS() – Add or subtract months from a date
• MONTHS_BETWEEN() – Calculate difference in months between two dates
• NEXT_DAY() – Get the next specific weekday after a given date
• LAST_DAY() – Get the last date of the month

Why You Need This:
These functions help you:
✔️ Format data for reports and validations
✔️ Calculate durations and review periods
✔️ Work with time-based logic in SQL test cases
✔️ Handle real-world data transformations

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