SQL, the acronym
for Structured Query Language, is a database query programming language that is
used to interact with the databases. The given below blog consists of the top 5
SQL Interview Questions which are more likely to be asked during the SQL
interview. The blog will not only help you understand the core concept of SQL
but also help you enhance the basic knowledge base.
1. Demonstrate
the different application areas of SQL.
Different
areas where SQL is used are:
·
To insert data into database
·
To delete data from database
·
To retrieve data from database
·
To update data into database
·
To create new tables, views and database
·
To execute database queries
·
To perform database operations
2. What are
fields and tables in a database?
In a
database, tables are the pattern containing a set of rows and columns for
storing the data. On the other hand, the columns in the table are known as
fields.
3. What is a
Join? What different types of join are present in SQL?
Join in SQL
is used to execute queries on multiple tables based on their relationship
between the fields. Different types of Joins are:
·
Inner Join
·
Right Join
·
Left Join
·
Full Join
4. What do you
mean by Index in SQL?
An Index in
SQL is a tuning method that is used to easily retrieve the data from the tables
based on the assigned index number or keys.
5. Differentiate
between normalization and denormalization.
Normalization
is the process through which the tables in the database are organized in order
to reduce the dependency and redundancy among them through adding, delete or
update.
On the
other hand, denormalization is used to add redundancy into the table and access
the data from a higher to lower normal forms.
You can
visit SQL Interview
Questions by Coding Tag for more insights. Coding tag has published a
huge amount of technical blogs and Technical interview questions. You can also
check out these blogs.
Source url:-https://www.linkedin.com/pulse/top-sql-interview-questions-2020-coding-tag/
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