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SQL Interview Questions and Answers
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About this Free Certificate Course
SQL is one of the essential requirements in tech industries. Data management has now become an integral part of all companies. Thus, every candidate must have a brief idea of SQL. DBMS is largely popular and is maintained by all industries to maintain their data. Hence, it becomes essential to prepare for SQL interview questions.
This free course will help you pass your SQL interviews by familiarizing you with all the critical SQL Interview Questions and Answers. Whether it's the role of an SDE or the role of a data analyst, SQL Questions are definitely asked in the interview. In any tech job role, one will be working with data, which has to be stored somewhere. If we have to extract specific data items from the entire dataset/table we have, we would need knowledge of SQL. Thus, understanding SQL and getting familiar with its queries becomes important. Hence, we are introducing this free SQL Interview Questions and Answers course through which you will go through SQL queries, Normalization queries, ER diagram queries, and sub-queries. You will also go through interview questions based on two projects called Broadband Management System and HR DBMS. This free course has all the essential SQL queries for interviews, and you will also learn to solve tricky SQL queries for interviews. To get to know all the SQL questions and answers enroll in this free SQL Interview Questions and Answers course and face the interviews with utmost confidence.
Course Outline
Hive is a data warehouse used to support interaction between the user and HDFS. This course will give you a demonstration using sample problem statements for your better understanding.
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Frequently Asked Questions
How do I prepare for an SQL interview?
There are a few frequently asked questions and a few important topics in SQL. It is more than sufficient to prepare them to crack interviews. Free courses offered by Great Learning on SQL interview questions and answers can guide you through them.
What are the important questions in SQL?
Questions will be usually asked on:
- Key elements of a database
- Relational keys
- Joins
- Select queries
- Data modelling
- Star schema
- Snowflake schema
- Dimension and fact table types
- Commands in SQL
- Types of queries
How do I start a SQL query?
SQL START QUERY starts/executes any query that is prepared or previously executed.
What is normalization in SQL?
Normalization is the process of restructuring a relational database with normal forms to reduce data redundancy and improve data integrity.
What are normalization rules in SQL?
There are 3 rules in normalization :
1. Every table should have:
- a primary key
- rows of equal length
- no 2 columns with the same kind of data
2. Every table should have no columns depending only on the primary key(if the primary key is composite).
3. Every table should have no columns not depending on the primary key at all.
