Are you
preparing for SQL as your career choice and don’t know where to start? Well,
then you are in the right place! In this blog, we have prepared a list of SQL Interview
Questions that are most likely to be asked by the interviewers. The
list of questions contains all the basic to advance level questions to help the
students prepare thoroughly for the technical interview.
1. What is
SQL?
SQL stands
for Structured Query Language which is a relational database management system
used to organize the data stored.
2. Can you
differentiate between SQL and MySQL?
SQL refers to the standard language which is
used to retrieve and manipulate data whereas, MySQL is a relational database the management system used to manage the SQL database.
3. What are
constraints in SQL?
Constraints
in SQL specify the rules for the data stored in the database. Some of the
constraints are:
·
CHECK
·
DEFAULT
·
NOT NULL
·
INDEX
·
UNIQUE
·
PRIMARY KEY
·
UNIQUE KEY
4. Define
tables and fields in SQL.
In SQL, the
data are stored in the form of horizontal rows and vertical columns. This type
of organization for the stored data is known as tables. While the rows are
known as records, the columns are known as fields that specify the categories
of the data stored.
5. What is Join
in SQL and its different types?
Join in SQL
is a keyword that is used to combine any two records or rows of more than one
table. The joining is done on the basis of the similarity of columns between
the tables. In SQL, there are 4 types of Joints:
·
(INNER) JOIN
·
LEFT (OUTER) JOIN
·
RIGHT (OUTER) JOIN
·
FULL (OUTER) JOIN
We have a blog of SQL Interview Questions that are most likely to be asked by the interviewers. If youwant to prepare well, you can also visit Technical Interview Questions to learn more. For more updated interview questions you can visit our website www.codingtag.com.
Source Url: https://www.linkedin.com/pulse/top-sql-interview-questions-prepare-2020-coding-tag/
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