Data Science Trainee
Data Science Trainee Interview Questions and Answers
Q1. Tell me four SQL Joins?
SQL Joins are used to combine rows from two or more tables based on a related column between them.
INNER JOIN: Returns rows when there is at least one match in both tables.
LEFT JOIN: Returns all rows from the left table and the matched rows from the right table.
RIGHT JOIN: Returns all rows from the right table and the matched rows from the left table.
FULL JOIN: Returns rows when there is a match in one of the tables.
Q2. What is python array?
Python array is a data structure that stores a collection of elements of the same data type.
Python array is a mutable sequence type that can store elements of the same data type.
Arrays in Python are created using the 'array' module.
Example: arr = array('i', [1, 2, 3, 4, 5])
Q3. Describe Supervised and unsupervised ML
Supervised ML uses labeled data to train the model, while unsupervised ML finds patterns in unlabeled data.
Supervised ML requires labeled data for training and testing
Examples of supervised ML include classification and regression algorithms
Unsupervised ML finds patterns and relationships in unlabeled data
Examples of unsupervised ML include clustering and dimensionality reduction algorithms
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