SQL Queries Code Interviews QA 50 plus

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Here are SQL-focused interview questions with only the relevant SQL code: 1. Find the second highest salary from an Employee table. SELECT MAX(Salary) AS SecondHighestSalary FROM Employees WHERE Salary < (SELECT MAX(Salary) FROM Employees); Using ROW_NUMBER(): WITH RankedSalaries AS (   SELECT Salary, ROW_NUMBER() OVER (ORDER BY Salary DESC) AS Rank   FROM Employees ) SELECT Salary AS SecondHighestSalary FROM RankedSalaries WHERE Rank = 2; --- 2. Write a query to calculate a running total of sales. SELECT   OrderID,   OrderDate,   Amount,   SUM(Amount) OVER (ORDER BY OrderDate) AS RunningTotal FROM Orders; --- 3. Retrieve customers who placed no orders using a LEFT JOIN. SELECT c.CustomerID, c.CustomerName FROM Customers c LEFT JOIN Orders o ON c.CustomerID = o.CustomerID WHERE o.OrderID IS NULL; --- 4. Write a query to find the top 3 highest salaries. SELECT DISTINCT Salary FROM Employees ORDER BY Salary DESC LIMIT 3; Using DENSE_RANK(): WIT...
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Introduction to genai data analytics and it is usecases

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Introduction to Generative AI for Data Analytics

Generative AI (GenAI) is a subset of artificial intelligence that focuses on creating new content, ideas, or insights by leveraging existing data. In the context of data analytics, GenAI can augment traditional methods by generating predictions, insights, or simulated data that improve decision-making, trend analysis, and operational efficiency.

Here’s an elaboration with practical examples:


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1. Data Synthesis for Training and Testing

Use Case: Creating synthetic datasets when real-world data is sparse, incomplete, or sensitive.

Example: A healthcare analytics company generates synthetic patient records using GenAI to train predictive models without violating privacy laws like HIPAA. The synthesized data mimics real-world scenarios and maintains statistical fidelity to actual patient data.



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2. Predictive Analytics

Use Case: Forecasting trends or events based on historical data patterns.

Example: In retail, GenAI predicts future demand for products by analyzing historical sales data, customer behavior, and external factors like holidays or economic conditions. This can optimize inventory management and reduce waste.



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3. Advanced Data Insights

Use Case: Discovering hidden patterns in large datasets.

Example: A financial institution uses GenAI to analyze transaction records and generate insights about unusual spending patterns that may indicate fraud. It highlights correlations that might not be evident using traditional analytics techniques.



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4. Automating Data Cleaning and Preparation

Use Case: Streamlining the preprocessing phase in analytics workflows.

Example: An e-commerce company uses GenAI to clean its customer review data by correcting typos, filling missing fields, and rephrasing unstructured text into standard formats. This significantly reduces the time spent on data preparation.



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5. Generating Explanatory Narratives

Use Case: Creating human-readable summaries of analytical results.

Example: A business intelligence tool integrated with GenAI generates an executive summary from complex dashboards. For instance, “Sales in Q4 increased by 15% due to a 25% rise in online purchases, particularly in the electronics segment.”



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6. Scenario Simulation

Use Case: Generating "what-if" scenarios for strategic planning.

Example: In urban planning, GenAI simulates traffic patterns based on proposed infrastructure changes. By modeling different scenarios, city planners can make data-driven decisions to reduce congestion.



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7. Personalization at Scale

Use Case: Enhancing customer experience through tailored recommendations.

Example: A streaming service uses GenAI to analyze viewing habits and generate personalized movie or series recommendations. It might even create customized marketing content targeting specific user preferences.



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8. Conversational Analytics

Use Case: Enabling natural language queries for analytics.

Example: A sales team interacts with a GenAI-powered chatbot to ask questions like, “What were our top-selling products last month?” The AI provides instant insights without requiring SQL or data visualization expertise.



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9. Automated Decision Support

Use Case: Providing actionable recommendations.

Example: In manufacturing, GenAI analyzes sensor data from machines to recommend maintenance schedules. This prevents costly downtime and extends the life of equipment.



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10. Visual Data Creation

Use Case: Generating visual representations of data trends.

Example: GenAI creates infographic-style visualizations summarizing key performance indicators (KPIs) for a marketing campaign, saving time on manual report creation.



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Key Advantages of GenAI in Data Analytics:

1. Efficiency: Automates repetitive tasks like data cleaning and visualization.


2. Accuracy: Reduces human errors in data interpretation and synthesis.


3. Scalability: Handles vast datasets that would overwhelm traditional tools.


4. Innovation: Generates new hypotheses and insights beyond human cognition.



Generative AI in data analytics transforms raw data into actionable intelligence, making it a game-changer for businesses and organizations striving to stay ahead in a data-driven world.

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