Product Feedback Scorecards

SQL practice question · Easy · Aggregation · Amazon

feedback has one row per product review (product_id, stars). Reviews with a NULL star value were not rated and must be ignored. For each product with at least one rating, compute the average star rating. Output columns: product_id, avg_stars (rounded to 2 decimals). Order by product_id ascending.

Table: feedback

Schema of feedback
Column	Type
product_id	INTEGER
stars	REAL

Schema of feedback

Column

Type

product_id

INTEGER

stars

REAL

Sample rows of feedback
product_id	stars
1	5
1	4
1	3
2	5
2	5
3	2

Sample rows of feedback

product_id

stars

Expected output on the sample data
product_id	avg_stars
1	4
2	5
3	2

Expected output on the sample data

product_id

avg_stars

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