SQL - GROUP BY and HAVING
What does the SQL clause
GROUP BY column1, column2 do?What does the SQL clause GROUP BY column1, column2 do?
easy📝 Conceptual Q11 of 15
Step-by-Step Solution
Solution:
Step 1: Understand GROUP BY purpose
The GROUP BY clause groups rows that have the same values in specified columns.Step 2: Apply to multiple columns
When multiple columns are listed, grouping happens on unique combinations of those columns' values.Final Answer:
Groups rows by unique combinations of values in column1 and column2 -> Option BQuick Check:
GROUP BY multiple columns = group by combinations [OK]
Quick Trick: GROUP BY multiple columns groups by combined unique values [OK]
Common Mistakes:
MISTAKES- Thinking GROUP BY sorts data
- Confusing GROUP BY with WHERE filtering
- Assuming GROUP BY joins tables
Master "GROUP BY and HAVING" in SQL
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