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From the following table, write a query that retrieves the maximum purchase amount for each customer within a specific range of customer IDs (between 3002 and 3007) and then filters out customers whose maximum purchase amount exceeds 1000.

Question

From the following table, write a query that retrieves the maximum purchase amount for each customer within a specific range of customer IDs (between 3002 and 3007) and then filters out customers whose maximum purchase amount exceeds 1000.

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Solution

Assuming that the table is named 'purchases' and it has columns 'customer_id' and 'purchase_amount', the SQL query would look like this:

SELECT customer_id, MAX(purchase_amount) as max_purchase
FROM purchases
WHERE customer_id BETWEEN 3002 AND 3007
GROUP BY customer_id
HAVING MAX(purchase_amount) <= 1000;

Here's the step by step explanation:

  1. SELECT customer_id, MAX(purchase_amount) as max_purchase: This part of the query is selecting the 'customer_id' and the maximum 'purchase_amount' for each 'customer_id'. The MAX() function is used to get the maximum value of 'purchase_amount'. The as keyword is used to rename the column in the output.

  2. FROM purchases: This part of the query specifies the table from which to retrieve the data, which is 'purchases' in this case.

  3. WHERE customer_id BETWEEN 3002 AND 3007: This is the condition that filters the 'customer_id' within the range of 3002 to 3007.

  4. GROUP BY customer_id: This part of the query groups the result by 'customer_id'. This is necessary because the MAX() function operates on each group of 'customer_id' separately.

  5. HAVING MAX(purchase_amount) <= 1000: This is another condition that filters out the groups (i.e., customers) whose maximum 'purchase_amount' exceeds 1000. The HAVING clause is used instead of WHERE because it operates on the result of the aggregation, not the individual rows.

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From the following table, write an SQL query to retrieve the customer ID, order date, and maximum purchase amount for each customer on each order date where the maximum purchase amount exceeds 2000.00. The results should be sorted by customer ID.

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