SQL Tutorial 7: SQL Operators

SQL Tutorial 7: SQL Operators

An operator is a reserved word or a character used primarily in an SQL statement’s WHERE clause to perform operation(s), such as arithmetic, comparisons and Logical operations.

Operators are used to specify conditions in an SQL statement and to serve as
conjunctions for multiple conditions in a statement.

Important Categories of SQL Operators are,

1) Arithmetic operators
2) Comparison operators
3) Logical operators Etc…
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1) Arithmetic Operators:

Arithmetic operators can perform arithmetical operations on numeric operands
involved.

Operator Description

+ Add
– Subtract
* Multiply
/ Division
% Modulus

Examples:

i) Add (+)
SELECT 30 + 20;

ii) Subtract (-)
SELECT 30 – 20;

iii) Multiply (*)
Select 30 * 20;

iv) Division
Select 40 / 20;

v) Modulus (%)
Select 40 % 19;
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2) Comparison Operators:

A comparison (or relational) operator is a mathematical symbol which is used to
compare between two values.

Comparison operators are used in conditions that compare one expression with
another. The result of a comparison can be TRUE, FALSE, or UNKNOWN
(an operator that has one or two NULL expressions returns UNKNOWN).

The following table describes different types of comparison operators

Operator Description

= Equal to
> Greater than
< Less than
>= Greater than or equal to
<= Less than or equal to
<> Not equal to

Examples:

i) Select * From abcd
Where City=’Pune’;

ii) Select * From abcd
Where Age > 25;

iii) Select * From abcd
Where Age >= 25;

iv) Select * From abcd
Where Age < 25;

v) Select * From abcd
Where Age <= 25;

vi) Select * From abcd
Where Age <> 25;
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SQL Operators Tutorial

3) Logical Operators:

There are three Logical Operators namely, AND, OR, and NOT. These operators
compare two conditions at a time to determine whether a row can be selected for the output. When retrieving data using a SELECT statement, You can use logical operators in the WHERE clause, which allows you to combine more than one condition.

Operator                      Description

ALL TRUE                    if all of the sub-query values meet the condition
AND TRUE                   if all the conditions separated by AND is TRUE
ANY  TRUE                  if any of the sub-query values meet the condition
BETWEEN TRUE      if the operand is within the range of comparisons
EXISTS TRUE             if the sub-query returns one or more records
IN TRUE                      if the operand is equal to one of a list of expressions
LIKE TRUE                  if the operand matches a pattern Try it
NOT                             Displays a record if the condition(s) is NOT TRUE
OR TRUE                   if any of the conditions separated by OR is TRUE
SOME TRUE             if any of the sub-query values meet the condition

Examples:

i) And
Select * From abcd
Where Age > 25 And City =’Hyderabad’;

ii) Or
Select * From abcd
Where Age > 40 Or City =’Pune’;

iii) Between
Select * From abcd
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SQL Step by Step Tutorials
http://www.gcreddy.com/2016/08/sql-tutorials.html

SQL Tutorial 1: Introduction to SQL
http://www.gcreddy.com/2016/07/introduction-to-sql.html

SQL Tutorial 2: SQL Overview
http://www.gcreddy.com/2016/08/sql-overview.html

SQL Tutorial 3: SQL Environment Setup
http://www.gcreddy.com/2016/09/sql-environment-setup.html

SQL Tutorial 4: Database Fundamentals and SQL Language Elements
http://www.gcreddy.com/2016/11/database-fundamentals-and-sql-language.html

SQL Tutorial 5: Data Definition Language
http://www.gcreddy.com/2016/11/sql-data-definition-language.html

SQL Tutorial 6: Data Manipulation Language
http://www.gcreddy.com/2017/06/sql-tutorial-6-data-manipulation.html

SQL Tutorial 7: SQL Operators
http://www.gcreddy.com/2017/06/sql-operators.html

SQL Tutorial 8: The Select Query
https://youtu.be/kid__0MNRps

SQL Tutorial 9: SQL Joins
https://youtu.be/K6U_WtYb-xQ

SQL Tutorial 10: SQL Functions
https://youtu.be/kgNnLWRZOiI

SQL Tutorial 11: SQL Comments
https://youtu.be/fg11vHRSsk0

SQL Tutorial 12: SQL Date Functions
https://youtu.be/EcanQwCjdWQ

Top 10 Database Management Systems
https://youtu.be/9R8xVrMgOb8

SQL vs. NoSQL Databases
https://youtu.be/1rX4yTqxdfQ

SQL Interview Questions and Answers
http://www.gcreddy.com/2013/01/sql-interview-questions.html
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