What is the meaning of "GROUP BY" clause in Mysql?

Solution (By Examveda Team)

The "GROUP BY" clause in MySQL is used to group rows that have the same value in a specific column. Think of it like sorting data into buckets based on a common characteristic.

For example, if you have a table of customer orders and you want to see how many orders each customer placed, you would use "GROUP BY customer_id".

Here's how the options break down:
Option A: Group data by column values - This is the correct answer! The "GROUP BY" clause groups data based on values within a specific column.
Option B: Group data by row values - This is incorrect. The "GROUP BY" clause doesn't group by entire rows.
Option C: Group data by column and row values - This is also incorrect. The "GROUP BY" clause focuses on grouping data by column values, not a combination of column and row values.
Option D: None of the mentioned - This is incorrect because Option A is the correct answer.

So, the "GROUP BY" clause is a powerful tool for aggregating and analyzing data in MySQL. It allows you to group similar data together and perform calculations based on those groups.