BigQuery Fundamentals

Quiz: Advanced BigQuery Applications and Optimization

メニューを表示するにはスワイプしてください

1. What is the primary benefit of using materialized views in BigQuery?

2. Which of the following is NOT allowed in a materialized view?

3. Why might you use TABLESAMPLE SYSTEM when querying a large table?

4. When would you use an external table from Google Cloud Storage

5. Which method would you use to prevent a query from failing when converting strings to integers

6. What does the `COALESCE()` function help with in error handling?

7. In the context of error handling, why would you validate quantities before calculating totals?

8. Which clause helps filter out invalid rows before performing calculations on primary keys

9. What happens if BigQuery detects a materialized view for a base table you're querying?

10. Which strategy helps when a CSV is too large to open or upload directly into BigQuery

What is the primary benefit of using materialized views in BigQuery?

正しい答えを選んでください

They reduce query costs and improve performance.

They store data permanently in external buckets.

They allow you to use DISTINCT with better speed.

They allow direct editing of base tables.

Which of the following is NOT allowed in a materialized view?

正しい答えを選んでください

GROUP BY clauses

DISTINCT keyword

Time-based refresh intervals

Aggregation

Why might you use TABLESAMPLE SYSTEM when querying a large table?

正しい答えを選んでください

To convert timestamps to UTC

To reduce scan cost and preview a subset of the data

To retrieve real-time data

To apply custom sorting logic

When would you use an external table from Google Cloud Storage

正しい答えを選んでください

When calculating real-time metrics.

When data is too large to upload directly into BigQuery.

When data needs to be duplicated.

When using materialized views.

Which method would you use to prevent a query from failing when converting strings to integers

正しい答えを選んでください

IS_VALID()

CAST()

COALESCE()

SAFE_CAST()

What does the COALESCE() function help with in error handling?

正しい答えを選んでください

It filters only numeric values.

It provides a fallback value when a field is null.

It removes duplicate rows.

It changes the data type of a column.

In the context of error handling, why would you validate quantities before calculating totals?

正しい答えを選んでください

To filter out irrelevant user IDs

To prevent negative or invalid values from skewing results

To convert all quantities to decimals

To remove duplicate entries

Which clause helps filter out invalid rows before performing calculations on primary keys

正しい答えを選んでください

ORDER BY

LIMIT

GROUP BY primary_key

WHERE primary_key IS NOT NULL

What happens if BigQuery detects a materialized view for a base table you're querying?

正しい答えを選んでください

It ignores the view and scans the base table.

It automatically redirects the query to the materialized view.

It prompts you to choose between the base table and the view.

It blocks the query.

Which strategy helps when a CSV is too large to open or upload directly into BigQuery

正しい答えを選んでください

Upload it to GCS and query as an external table

Use a Google Sheet import

Compress the file and unzip it in BigQuery

Convert the file into multiple smaller JSONs

すべて明確でしたか？

どのように改善できますか？

フィードバックありがとうございます！

セクション 4. 章 5

AIに質問する

AIに質問する

何でも質問するか、提案された質問の1つを試してチャットを始めてください

セクション 4. 章 5

some-alt