[Solved] When you apply GROUP BY on a column in an SQL query, what happens to the rows? — Ans: Rows are combined into groups based on the column's values | SQL

SQL - GROUP BY and HAVING

When you apply GROUP BY on a column in an SQL query, what happens to the rows?

ARows are duplicated for each unique value in the column

BRows are sorted in ascending order by the column

CRows are deleted if they have duplicate values in the column

DRows are combined into groups based on the column's values

Step-by-Step Solution

Solution:

Step 1: Understand GROUP BY
The GROUP BY clause groups rows that have the same values in specified columns into summary rows.
Step 2: Effect on rows
Rows with identical values in the grouped column are combined into one group.
Final Answer:
Rows are combined into groups based on the column's values -> Option D
Quick Check:
Grouping means aggregation by column values [OK]

Quick Trick: GROUP BY clusters rows by column values [OK]

Common Mistakes:

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When you apply GROUP BY on a column in an SQL query, what happens to the rows?