CompTIA Data+ (DA0-002)Data MiningEasy
A data analyst is working with a large dataset containing customer order information. They need to retrieve all orders placed by customers who live in 'New York' AND whose order total is greater than $500. Which of the following SQL clauses would be most effective for filtering the results based on these two conditions?
- AORDER BY
- BWHERE
- CGROUP BY
- DHAVING
Show answer & explanationAnswer & explanation
Correct answer: B. WHERE
The WHERE clause is used to filter individual rows based on specified conditions before any grouping occurs. In this scenario, filtering by customer location and order total directly impacts which rows are included in the result set.
Why the other options are wrong
- A. ORDER BY is used to sort the result set, not to filter rows.
- C. GROUP BY is used to aggregate data into groups, not to filter individual rows based on conditions.
- D. HAVING is used to filter groups of data after aggregation, not individual rows.
SQL WHERE Clause
The WHERE clause in SQL is used to extract only those records that fulfill a specified condition or conditions.
- Filters individual rows before aggregation.
- Can combine multiple conditions using AND, OR, NOT operators.
- Commonly used with SELECT, UPDATE, DELETE statements.
Memory trick: Where to filter? Before the group, at the row!