KwickClips Databases and SQL · 36 sec · free
How many rows does GROUP BY return?
Short answer. One per group.
Can you SELECT name with GROUP BY sec?
No. A group has many names.
Remember
| One output row per group |
| SELECT: group column or aggregate |
Five rows in, two rows out. How? Group by sec makes one group per section. Count star counts each group. One row per group. Select only the group column or aggregates.
This clip is from the full lesson: GROUP BY and HAVING — 6 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 12 Computer Science (083), CBSE Class 12 Informatics Practices (065), CBSE Class 12 Information Technology (802)
More KwickClips from this lesson
What does GROUP BY do first?36 sec
Where do aggregates belong?36 sec
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