¨ Can also perform grouping on a relation before
computing aggregates
🞑 Specify a GROUP BY A1,A2,… clause at end of query
¨ Example:
“Find the average loan amount for each branch.”
SELECT branch_name, AVG(amount) AS avg_amt
FROM loan GROUP BY branch_name;
🞑 First, tuples in loan are grouped by branch_name
🞑 Then, aggregate functions are applied to each group
branch_name | avg_amt |
Central Downtown Mianus North Town Perryridge Redwood Round Hill | 570.000000 1250.000000 500.000000 7500.000000 1400.000000 2000.000000 900.000000 |
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