IPG Mediabrands Interview Questions and Answers for Freshers

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.

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

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