Introduction

Here we discuss the SQL Queries Examples with Answers. If you want to improve your SQL skills, then install a SQL package like MySQL and start practicing with it. To get you started, we’ve outlined a few SQL Queries Examples with Answer in this blog.

Solving practice questions is the fastest way to learn any subject. That’s why we’ve selected a set of SQL Queries Examples with Answer that you can use to step up your learning.

What is SQL?

Before we know about the SQL Queries Examples with Answers, you should know first what SQL is. Structured query language (SQL) is a programming language for storing and processing information in a relational database. A relational database stores information in tabular form, SQL Queries Examples with Answer, with rows and columns representing different data attributes and the various relationships between the data values. SQL codes, You can use SQL statements to store, update, remove, search, and retrieve information from the database.

Below are some SQL Queries Examples with Answer:

Why is SQL important?

The first SQL Queries Examples with Answer is why SQL is important. Structured query language (SQL) is a popular query language that is frequently used in all types of applications. Data analysts and developers learn and use SQL because it integrates well with different programming languages. SQL Queries Examples with Answer, For example, they can embed SQL queries with the Java programming language to build high-performing data processing applications with major SQL database systems such as Oracle or MS SQL Server.

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What is a SQL server?

SQL Server is the second SQL Queries Examples with Answer as it is the official name of Microsoft’s relational database management system that manipulates data with SQL. The MS SQL Server has several editions, each designed for specific workloads and requirements.

What is a Query in a SQL?

A query is a request for data or information from a database table or combination of tables. In the context of queries in a database, SQL Queries Examples with Answer, it can be either a select query or an action query. SQL Queries Examples with Answer, A select query is a data retrieval query, while an action query asks for additional operations on the data, such as insertion, updating, or deletion. Most formal queries are written in SQL. You must know this, before you know the SQL Queries Examples with Answers. 

Benefits of Using a Query Tool

To make it easier to find the information you want, websites such as Amazon, Google, etc. SQL Practice puestions, have search tools on their Web pages. These search tools use a query language that allows you to type in your request for information using plain language, as opposed to a SQL query which requires technical understanding, this is also one of the most asked SQL Queries Examples with Answer.

What are the Basic Queries in SQL?

With a database query tool like FlySpeed SQL Query, users don’t need to know Structured Query Language (SQL) to perform basic database queries; however, working knowledge of SQL syntax can improve search efficiency. The SQL Queries Examples with Answers can also help your SQL interview.

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SQL Queries Examples with Answer

Employee Info Table:

EmpID	EmpFname	EmpLname	Department	Project	Address	DOB
1	Sanjay	Mehra	HR	P1	Hyderabad(HYD)	01/12/1976
2	Ananya	Mishra	Admin	P2	Delhi(DEL)	02/05/1968
3	Rohan	Diwan	Account	P3	Mumbai(BOM)	01/01/1980
4	Sonia	Kulkarni	HR	P1	Hyderabad(HYD)	02/05/1992
5	Ankit	Kapoor	Admin	P2	Delhi(DEL)	03/07/1994

Employee Position Table:

Write an SQL query to fetch “FIRST_NAME” from the Worker table using the alias name <WORKER_NAME>.

Answer:

The required query is:

Select FIRST_NAME AS WORKER_NAME from Worker;

Write an SQL query to fetch “FIRST_NAME” from the Worker table in upper case.

Ans.

The required query is:

Select upper(FIRST_NAME) from Worker;

Write an SQL query to fetch unique values of DEPARTMENT from the Worker table.

Ans.

The required query is:

Select distinct DEPARTMENT from Worker;

Write an SQL query to find the position of the alphabet (‘a’) in the first name column ‘Ananya’ from the Worker table.

Ans.

The required query is:

Select INSTR(FIRST_NAME, BINARY’a’) from Worker where FIRST_
NAME = ‘Ananya’;

Write an SQL query to print the DEPARTMENT from the Worker table after removing white spaces from the left side.

Ans.

The required query is:

Select LTRIM(DEPARTMENT) from Worker;

Write an SQL query to print the FIRST_NAME from the Worker table after replacing ‘a’ with ‘A’.

Ans.

The required query is:

Select REPLACE(FIRST_NAME,’a’,’A’) from Worker;

Write an SQL query to print all Worker details from the Worker table order by FIRST_NAME Ascending.

Ans.

The required query is:

Select * from Worker order by FIRST_NAME asc;

Write an SQL query to print details for Workers with the first names “Sanjay” and “Mehra” from the Worker table.

Ans.

The required query is:

Select * from Worker where FIRST_NAME in (‘Sanjay’,’Mehra’);

Write an SQL query to print details of Workers with DEPARTMENT name as “Admin”.

Ans.

The required query is:

Select * from Worker where DEPARTMENT like ‘Admin%’;

Write an SQL query to print details of the Workers whose FIRST_NAME ends with ‘a’.

Ans.

The required query is:

Select * from Worker where FIRST_NAME like ‘%a’;

Write a query to fetch details of employees with the address as “DELHI(DEL)”

Ans:

SELECT * FROM EmployeeInfo WHERE Address LIKE ‘DELHI(DEL)%’;

Write a query to retrieve duplicate records from a table.

Ans:

SELECT EmpID, EmpFname, Department COUNT(*)

FROM EmployeeInfo GROUP BY EmpID, EmpFname, Department

HAVING COUNT(*) > 1;

Write a query to retrieve the list of employees in the same department.

Ans:

Select DISTINCT E.EmpID, E.EmpFname, E.Department

FROM EmployeeInfo E, Employee E1

WHERE E.Department = E1.Department AND E.EmpID != E1.EmpID;

Write a query to fetch 50% of records from the EmployeeInfo table.

Ans:

SELECT *

FROM EmployeeInfo WHERE

EmpID <= (SELECT COUNT(EmpID)/2 from EmployeeInfo);

Write an SQL query to print details of the Workers who joined in Feb’2014.

Ans.

The required query is:

Select * from Worker where year(JOINING_DATE) = 2014 and month(JOINING_DATE) = 2;

Write an SQL query to show only odd rows from a table.

Ans.

The required query is:

SELECT * FROM Worker WHERE MOD (WORKER_ID, 2) <> 0;

Write an SQL query to fetch intersecting records of two tables.

Ans.

The required query is:

(SELECT * FROM Worker)

INTERSECT

(SELECT * FROM WorkerClone);

Write an SQL query to show the current date and time.

Ans.

The following MySQL query returns the current date:

SELECT CURDATE();

Write an SQL query to determine the nth (say n=5) highest salary from a table.

Ans.

MySQL query to find the nth highest salary:

SELECT Salary FROM Worker ORDER BY Salary DESC LIMIT n-1,1;

Write an SQL query to fetch the list of employees with the same pay.

Ans.

The required query is:

Select distinct W.WORKER_ID, W.FIRST_NAME, W.Salary 

from Worker W, Worker W1 

where W.Salary = W1.Salary 

and W.WORKER_ID != W1.WORKER_ID;

Write an SQL query to fetch intersecting records of two tables.

Ans.

The required query is:

(SELECT * FROM Worker)

INTERSECT

(SELECT * FROM WorkerClone);

Write an SQL query to fetch the names of workers who earn the highest salary.

Ans.

The required query is:

SELECT FIRST_NAME, SALARY from Worker WHERE SALARY=(SELECT max(SALARY) from Worker);

Conclusion

An SQL Queries Examples with Answers is a statement built by putting together various SQL commands. These SQL commands together perform a specific task to access, manage, modify, update, control, and organize your data stored in a database and managed via a DBMS.

Frequently Asked Questions