Recall & Review
beginner
What does 'result control' mean in database queries?
Result control means managing what data you get back from a query, like which rows, columns, and order, so you only get what you need.
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beginner
Why is controlling query results important?
It helps avoid too much data, makes queries faster, and shows only useful information, making it easier to understand and use.
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beginner
How can you limit the number of rows returned in PostgreSQL?
Use the LIMIT clause, for example:
SELECT * FROM table LIMIT 5; returns only 5 rows.Click to reveal answer
beginner
What is the role of the WHERE clause in result control?
WHERE filters rows based on conditions, so you get only rows that match what you want.
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beginner
How does ordering results help in result control?
ORDER BY sorts the rows so you can see data in a meaningful order, like newest first or alphabetically.
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Which SQL clause limits the number of rows returned?
✗ Incorrect
LIMIT sets the maximum number of rows returned by a query.
What does the WHERE clause do?
✗ Incorrect
WHERE filters rows to include only those that meet the condition.
Why is controlling query results important?
✗ Incorrect
Controlling results helps queries run faster and shows only needed data.
Which clause sorts the query results?
✗ Incorrect
ORDER BY arranges rows in a specified order.
If you want only 10 rows from a table, which clause do you use?
✗ Incorrect
LIMIT 10 returns only the first 10 rows.
Explain why controlling the result of a database query is important.
Think about what happens if you get all data without filtering or limits.
You got /4 concepts.
Describe how you can control the rows returned by a PostgreSQL query.
Consider clauses that filter, limit, and order data.
You got /3 concepts.