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Home / Interview Subjects / Teradata
WithoutBook LIVE Mock Interviews Teradata Related interview subjects: 24

Interview Questions and Answers

Know the top Teradata interview questions and answers for freshers and experienced candidates to prepare for job interviews.

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The Best LIVE Mock Interview - You should go through before interview

Know the top Teradata interview questions and answers for freshers and experienced candidates to prepare for job interviews.

Interview Questions and Answers

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Intermediate / 1 to 5 years experienced level questions & answers

Ques 1

Explain the concept of Primary Index in Teradata.

Primary Index is used for distributing data across the AMPs (Access Module Processors) in a Teradata system. It determines the distribution of rows in a table based on the primary index value.

Example:

CREATE TABLE employee (emp_id INT, emp_name VARCHAR(50), PRIMARY INDEX (emp_id));

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Ques 2

What is the importance of the SET table in Teradata?

SET tables in Teradata eliminate duplicate rows, ensuring that each row is unique. They are useful in scenarios where you want to store distinct values.

Example:

CREATE SET TABLE unique_employees AS SELECT DISTINCT * FROM employees;

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Ques 3

Explain the use of the COLLECT STATISTICS statement in Teradata.

The COLLECT STATISTICS statement is used to gather statistics on columns or indexes in a Teradata table. It helps the query optimizer make better decisions for query execution plans.

Example:

COLLECT STATISTICS COLUMN (emp_id, emp_name) ON employee;

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Ques 4

Differentiate between INNER JOIN and LEFT JOIN in Teradata.

INNER JOIN returns only the matching rows from both tables, while LEFT JOIN returns all rows from the left table and the matching rows from the right table.

Example:

SELECT * FROM employees e INNER JOIN departments d ON e.department_id = d.department_id;

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Ques 5

Explain the use of the PARTITION BY clause in Teradata.

The PARTITION BY clause in Teradata is used in window functions to divide the result set into partitions to which the window function is applied separately. It is commonly used with functions like ROW_NUMBER() and RANK().

Example:

SELECT emp_id, emp_name, salary, ROW_NUMBER() OVER (PARTITION BY department_id ORDER BY salary DESC) as row_num FROM employees;

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Ques 6

Explain the purpose of the Teradata PRIMARY KEY constraint.

The PRIMARY KEY constraint in Teradata is used to uniquely identify each row in a table. It ensures that the values in the specified columns are unique and not NULL.

Example:

CREATE TABLE employees (emp_id INT PRIMARY KEY, emp_name VARCHAR(50), department_id INT);

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Ques 7

Explain the use of the Teradata Aggregate Functions.

Teradata provides various aggregate functions like SUM, AVG, MIN, MAX, and COUNT to perform calculations on a set of values. These functions are commonly used in SELECT queries for summarizing data.

Example:

SELECT department_id, AVG(salary) FROM employees GROUP BY department_id;

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Ques 8

Explain the concept of Vantage in Teradata.

Vantage is the modern analytics platform from Teradata that integrates data analytics, data lakes, and data warehouses. It allows users to analyze and derive insights from data stored in different environments.
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Ques 9

Explain the purpose of the Teradata LOCKING modifier.

The LOCKING modifier in Teradata is used to specify the type of locks to be used during a query. It allows users to control the level of concurrency and the type of locks acquired on tables.

Example:

SELECT * FROM employees WHERE department_id = 10 FOR READ UNCOMMITTED LOCKING ROW FOR ACCESS;

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Ques 10

Explain the Teradata INDEX constraints and their significance.

INDEX constraints in Teradata define the indexes on tables, specifying how data is physically organized. They are crucial for optimizing query performance by allowing the database to locate and retrieve data more efficiently.
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