PCDE Practice Question: Define data structures and implement SQL for Business Intelligence
This PCDE practice question tests your understanding of define data structures and implement sql for business intelligence. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Error: Cannot query over table 'mydataset.sales' without a filter over partition column 'order_date' that can be used for partition elimination
Refer to the exhibit. What is the likely cause of this error?
Error: Cannot query over table 'mydataset.sales' without a filter over partition column 'order_date' that can be used for partition elimination
A
The table is a view
Why wrong: Views do not have partition columns; the error refers to a table.
B
The query does not include WHERE clause with partition column
The error states no filter over the partition column, meaning the query tries to scan all partitions, which is blocked by a query optimizer or cost control.
C
The table is not partitioned
Why wrong: The error message explicitly references partition column, so the table is partitioned.
D
The user does not have permission to query the table
Why wrong: Permission errors would produce a different message (e.g., Access Denied).
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The query does not include WHERE clause with partition column
The error occurs because the query attempts to access a partitioned table without specifying the partition column in the WHERE clause. In Snowflake (the platform implied by PCDE context), querying a large partitioned table without a partition filter forces a full scan of all partitions, which can exceed resource limits or time out. The correct approach is to include the partition column in the WHERE clause to enable partition pruning.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The table is a view
Why it's wrong here
Views do not have partition columns; the error refers to a table.
✓
The query does not include WHERE clause with partition column
Why this is correct
The error states no filter over the partition column, meaning the query tries to scan all partitions, which is blocked by a query optimizer or cost control.
Related concept
Read the scenario before looking for a memorised answer.
✗
The table is not partitioned
Why it's wrong here
The error message explicitly references partition column, so the table is partitioned.
✗
The user does not have permission to query the table
Why it's wrong here
Permission errors would produce a different message (e.g., Access Denied).
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that any table can be queried without a WHERE clause, but for partitioned tables, the partition column must be included in the WHERE clause to avoid full partition scans and associated errors.
Detailed technical explanation
How to think about this question
Partition pruning is a performance optimization where the query engine eliminates irrelevant partitions based on the WHERE clause filter on the partition key. Without this filter, Snowflake must scan all micro-partitions, leading to excessive I/O and potential query failure. In Snowflake, partition columns are defined using the PARTITION BY clause in CREATE TABLE, and the query optimizer relies on the WHERE clause to skip partitions that do not match the filter criteria.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Define data structures and implement SQL for Business Intelligence — This question tests Define data structures and implement SQL for Business Intelligence — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The query does not include WHERE clause with partition column — The error occurs because the query attempts to access a partitioned table without specifying the partition column in the WHERE clause. In Snowflake (the platform implied by PCDE context), querying a large partitioned table without a partition filter forces a full scan of all partitions, which can exceed resource limits or time out. The correct approach is to include the partition column in the WHERE clause to enable partition pruning.
What should I do if I get this PCDE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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