Prev Next

GROUP BY Clause

The GROUP BY clause is used to group rows that have the same values in specified columns. It is often used with aggregate functions like SUM, AVG, and COUNT.

Example: Using GROUP BY Clause

SELECT City, COUNT(*) FROM FreedomFighters GROUP BY City;

Output:

Returns the number of freedom fighters from each city.

Do's and Don'ts

Do's

  • Use GROUP BY with aggregate functions for meaningful data analysis.
  • Ensure all selected columns are either grouped or aggregated.

Don'ts

  • Don't use GROUP BY without understanding how it affects your data.
  • Don't forget to test the query to ensure it produces the expected results.
Prev Next