Given three tables: `Employees`

, `Salaries`

, and `Departments`

, write an SQL query to find the salary of each employee along with their corresponding department name. The `Employees`

table contains columns `employee_id`

, `employee_name`

, and `department_id`

. The `Salaries`

table has columns `employee_id`

and `salary`

. The `Departments`

table includes `department_id`

and `department_name`

. Provide a query to list `employee_name`

, `salary`

, and `department_name`

.

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Can you explain **Data Mining**, **Data Pipeline**, and **Data Warehouse**? Highlight the purpose and key differences between these three concepts.

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Using the tables Employees, Salaries, and Departments, can you write an SQL query to find the names of employees who earn more than the average salary in their department? The Employees table contains columns employee_id, employee_name, and department_id. The Salaries table has columns employee_id and salary. The Departments table includes department_id and department_name.

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Using the tables Employees, Salaries, and Departments, can you write an SQL query to find the names of employees who earn more than the average salary in their department? The Employees table contains columns employee_id, employee_name, and department_id. The Salaries table has columns employee_id and salary. The Departments table includes department_id and department_name.

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Can you explain what a LEFT JOIN is in SQL and give an example of when you might use it?

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Can you write an SQL query to check if a given string is a palindrome? A palindrome is a string that reads the same forward and backward. Assume the input string is stored in a table named Strings with a column named input_string.

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Can you write an SQL query to check if a number is a perfect square without using the square root function? Assume the number is stored in a table named `Numbers`

with a column named `num`

.

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Can you explain what the Software Development Life Cycle (SDLC) is, and describe its different phases?

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Can you compare Power BI and Tableau, especially in terms of their features, usability, and use cases in a business context?

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Can you explain how the VLOOKUP function works in Excel and provide an example of its usage?

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Can you explain the difference between Measures and Calculated Columns in Power BI, and how filters are used to manipulate data within reports and dashboards?

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Can you explain how to select the best model for a given dataset? What are the steps and criteria involved in evaluating and choosing the optimal model?

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Can you explain the difference between the WHERE and HAVING clauses in SQL?

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Can you explain what MapReduce is, and describe its purpose and how it works?

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Can you write SQL syntax to connect two tables horizontally and vertically? Please provide examples of both methods.

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Given the following R output from a linear regression analysis, interpret the results and explain the key components of the output.

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Given a dataset containing customer transaction records in a CSV format, describe how you would create a data quality dashboard to track key metrics like missing values, duplicate entries, and data type mismatches. Specify the tools and technologies you would use.

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