I have a table with five thousand rows and 20 columns. There are 75 unique items, and 30 different levels of discounts (e.g. 3%, 5%). I run the SQL query below. How many columns will be returned?

SELECT item, sum(price) FROM sales

WHERE discount 10

GROUP BY item

HAVING sum(price) 200

Question

I have a table with five thousand rows and 20 columns. There are 75 unique items, and 30 different levels of discounts (e.g. 3%, 5%). I run the SQL query below. How many columns will be returned?

SELECT item, sum(price) FROM sales

WHERE discount > 10

GROUP BY item

HAVING sum(price) > 200

BlackTom AI · Accepted Answer

We start by identifying what the SQL query is selecting and how many columns that implies.

The SELECT clause reads: SELECT item, sum(price)
This means the result set will include two expressions per row: the value of item and the aggregate sum(price).

Next, consider the FROM clause and the grouping logic. The query uses FROM sales and GROUP BY item, which aggregates rows that share the same item value into groups. For each group, the engine computes sum(price).

The WHERE clause imposes a filter on the rows before grouping: discount > 10. Only rows with a discount greater than 10% are considered for the aggregation.

The HAVING clause then filters the groups after aggregation: HAVING sum(price) > 200. Only those item groups whose total price sum exceeds 200 are included in the final result set.

Putting this together, the final result set will present one row per item that passes the HAVING condition, and each row will display two values: the item and the corresponding sum(price).

In terms of columns, the number of columns in the result is determined by the number of expressions in the SELECT list, which is two in this case: item and sum(price).

Thus, the query will return a two-column result set, with each row consisting of an item value and its aggregated sum(price) for that item under the specified filters.

I have a table with five thousand rows and 20 columns. There are 75 unique items, and 30 different levels of discounts (e.g. 3%, 5%). I run the SQL query below. How many columns will be returned? SELECT item, sum(price) FROM sales WHERE discount > 10 GROUP BY item HAVING sum(price) > 200

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