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| Section | Weight | Objectives |
|---|---|---|
| Use Built-in Functions and Create UDFs | 10–15% | - User-Defined Functions (UDFs) - Scalar, aggregate, table, system functions |
| Build and Troubleshoot Advanced SQL Queries | 20–25% | - Query optimization and troubleshooting - Complex joins, subqueries, window functions - Semi-structured data processing |
| Prepare and Present Data | 10–15% | - Snowsight dashboards and sharing results - Data visualization and reporting - Align outputs with business requirements |
| Perform Predictive Analysis | 5–10% | - Using Snowflake ML and built-in analytics - Forecasting and predictive modeling |
| Perform Simple Data Transformations for Analysis | 15–20% | - Data cleansing, standardization, type conversion - Handling NULLs and structuring datasets - Views, materialized views, CTEs |
| Perform Descriptive and Diagnostic Analysis | 10–15% | - Exploratory and ad-hoc analysis - Statistical summarization and trend analysis - Anomaly detection and root cause analysis |
| Prepare and Load Data | 15–20% | - Data ingestion methods: COPY INTO, stages, Snowpipe - External tables and data validation - File formats: CSV, JSON, Parquet, Avro |
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NEW QUESTION # 35
Why would a Data Analyst use a dimensional model rather than a single flat table to meet BI requirements for a virtual warehouse? (Select TWO).
Answer: D,E
Explanation:
In the field of data warehousing and business intelligence (BI), choosing the right data model is crucial for long-term maintainability and user accessibility. While a single flat table might seem simple initially, dimensional modeling (typically using Star or Snowflake schemas) provides distinct advantages for enterprise analytics.
1. Scalability and Flexibility (Option C)
Combining all attributes into a single flat table creates a highly rigid structure. Every time a new attribute is added to a dimension (e.g., adding a "Promotion Category" to a product), the entire flat table must be rewritten or altered, which is inefficient for large datasets. Furthermore, flat tables often contain redundant data, leading to "update anomalies" where a change in a dimension attribute must be propagated across millions of rows. A dimensional model separates changing business processes (Facts) from the context of those processes (Dimensions), allowing the schema to scale and evolve independently.
2. Ad-hoc Analysis for Power Users (Option D)
Dimensional models are specifically designed to be intuitive for business users and BI tools. By organizing data into Facts (measurable metrics) and Dimensions (descriptive attributes), power users can easily "slice and dice" data across different hierarchies. For example, a user can quickly run an ad-hoc query to compare "Total Sales" (Fact) by "Store Region" (Dimension) and "Calendar Month" (Dimension). This structure provides a predictable and standardized "language" for the data, making it easier for users to build their own reports without needing a Data Analyst to create a custom flat table for every specific request.
Evaluating the Distractors:
* Option A and E: These are common misconceptions. Modern cloud data warehouses like Snowflake are often highly optimized for wide "flat" tables due to columnar storage and sophisticated pruning. In many cases, a flat table may actually outperform a multi-table join (dimensional model) because it avoids the computational overhead of the join itself.
* Option B: This is factually incorrect. Flat tables are denormalized (repeating data), which generally takes more storage space. Dimensional modeling is a form of normalization that saves space by storing descriptive strings once in a dimension table rather than repeating them for every transaction in a fact table.
NEW QUESTION # 36
You have a Snowflake table 'RAW DATA containing a 'VARIANT column called 'json_data'. This column stores JSON objects representing customer orders. The structure includes a nested array of items within each order. You need to create a flattened table called 'ORDER ITEMS with the following columns: 'order_id', and However, the field is not directly present in the JSON data'. Instead, it needs to be derived by concatenating the 'order_id' with the index (ordinal position) of the item within the 'items' array. The structure looks like this: { "order_id": "ORD-123", "customer_id": "CUST-456", "items": [ { "item_name": "Laptop", "item_price": 1200 }, { "item_name": "Mouse", "item_price": 25 } ] } Which of the following SQL statements correctly creates the 'ORDER ITEMS table?
Answer: C
Explanation:
Option E correctly uses the 'LATERAL FLATTEN' function to unnest the 'items' array. The key is using 'f.seq' (sequence number) provided by 'FLATTEN' function, which is the ordinal position of the item in the array (starting from 1), to create the item_id. It concatenates the order_id with the sequence number to generate a unique item_id. Option A is wrong because row_number is an aggregate function, and needs Group by to execute. Option B uses f.index, which does not exist in the output of Lateral flatten. Options C is correct in most of the parameters, however, 'raw_data' alias is missing, as a result the result will be error. Option D also uses seq, however it adds 1, which changes the index to start from 1, which might be wrong.
NEW QUESTION # 37
You are tasked with validating the 'SALES DATA' table containing sales records. One of the columns, 'SALE AMOUNT', is defined as VARCHAR, but it should be a NUMERIC. Some rows contain non-numeric characters and NULL values represented as the string 'NULL'. You need to identify rows that will cause errors when casting 'SALE AMOUNT to NUMERIC, and replace these rows with valid values using Snowflake SQL. Which of the following SQL statements, when executed in sequence, effectively identifies and corrects problematic 'SALE AMOUNT' values? Note: Assume the "REPLACE INVALID CHARACTERS' UDF correctly replaces non- numeric characters with empty strings.
Answer: A
Explanation:
Option D correctly addresses all aspects of the problem. First, it replaces 'NULL' string values with actual NULLs. Then, it creates a temporary table, 'INVALID SALES, containing rows where 'SALE AMOUNT, after removing invalid characters, cannot be converted to a DECIMAL. Finally, it updates these invalid rows in the original table with a default value of '0'. TRY_TO_DECIMAL is important for handling decimal values that cannot be converted
NEW QUESTION # 38
When managing Snowsight dashboards, what significance do subscriptions and updates hold in meeting business requirements?
Answer: C
Explanation:
Subscriptions and updates ensure timely information delivery, meeting business requirements.
NEW QUESTION # 39
When connecting BI tools to Snowflake for dashboard creation, which factors must be considered to ensure effective integration? (Select all that apply)
Answer: A,B,C
Explanation:
Effective integration involves considering network latency, compatibility, and encryption requirements for Snowflake data.
NEW QUESTION # 40
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