Think 360 Data Analyst Interview Questions and Answers

SQL Joins are used to combine rows from two or more tables based on a related column between them.

• SQL Joins are used to retrieve data from multiple tables based on a related column between them.

• Common types of SQL Joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column;

Python numpy provides various functions for numerical operations on arrays.

• numpy.sum() - calculates the sum of array elements

• numpy.mean() - calculates the mean of array elements

• numpy.max() - returns the maximum value in an array

• numpy.min() - returns the minimum value in an array

• numpy.std() - calculates the standard deviation of array elements

Joins are used in databases to combine rows from two or more tables based on a related column between them.

• Joins are used to retrieve data from multiple tables based on a related column between them

• Common types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN

• Example: SELECT * FROM table1 INNER JOIN table2 ON table1.column = table2.column

Processing speed of scripting languages varies based on factors like code complexity and optimization.

• Processing speed can vary based on the specific task being performed.

• Compiled languages like C++ tend to be faster than interpreted languages like Python.

• Optimizing code can improve processing speed.

• JavaScript can be faster than Python for certain tasks.

• Consider using libraries or frameworks optimized for performance.

Data validation ensures data is accurate and useful. Delete removes specific records, truncate removes all records, drop removes entire table.

• Data validation ensures data is accurate, complete, and useful for analysis

• Delete removes specific records from a table based on a condition

• Truncate removes all records from a table, but keeps the table structure

• Drop removes an entire table from the database

• Example: DELETE FROM t...read more

Led various projects in previous organization including data analysis, process improvement, and system implementation.

• Implemented new data analysis tools to improve efficiency

• Led a team in developing a process improvement strategy resulting in cost savings

• Managed the implementation of a new system to streamline operations

Reverse a string in Python using slicing

• Use string slicing with a step of -1 to reverse the string

• Example: 'hello'[::-1] will return 'olleh'

Led a cross-functional team to implement a new CRM system

• Managed project timeline and budget effectively

• Collaborated with IT, sales, and marketing teams to gather requirements

• Provided training and support to end users post-implementation