Comparison Operator - SQL Server Operators

In SQL Server, comparison operators are used to compare two values and return a Boolean value (True or False) based on whether the comparison is true or false. This page will discuss the Comparison Operator in SQL Server, its syntax, examples, output, explanation, use cases, important points, and the Summary.

Syntax

The comparison operator is used to compare two expressions and return a Boolean value based on the comparison. Here is the syntax of the comparison operator:

expression1 operator expression2

Where 'expression1' and 'expression2' are the expressions being compared, and 'operator' is the comparison operator used.

Comparison operators in SQL Server include:

• = - Equal to
• <> or != - Not equal to
• > - Greater than
• < - Less than
• >= - Greater than or equal to
• <= - Less than or equal to

Example

Here are some examples of using comparison operators in SQL Server:

SELECT * FROM employees WHERE salary > 50000;
SELECT * FROM students WHERE age <> 19;
SELECT * FROM products WHERE price <= 100;

In the first example, the query returns all the employees with a salary greater than 50000. In the second example, the query returns all the students who are not 19 years old. In the third example, the query returns all the products with a price of 100 or less.

Output

The output of a comparison operator query is always a Boolean value. The Boolean value is True if the comparison is true, and False if the comparison is false. If the query is used in a WHERE clause, then the output will be the rows where the comparison is true.

Explanation

Comparison operators are used to compare two expressions and return a Boolean value. They are commonly used in WHERE clauses to filter the data based on the comparison. For example, you can use the > operator to filter employees with salaries greater than a certain amount.

Use

Comparison operators are used to compare two expressions in SQL Server. They are most commonly used in the WHERE clause to filter the data based on a specific condition. They are also used in JOINs and HAVING clauses to compare values from different tables.

Important Points

• Comparison operators return a Boolean value (True or False).
• Comparison operators are used to compare two expressions.
• Comparison operators are commonly used in the WHERE clause to filter the data based on a specific condition.

Summary

In this page, we discussed the comparison operator in SQL Server, including its syntax and examples. We also discussed the output, explanation, use cases, important points, and the summary of SQL Server's = equal to, <> or != not equal to, > greater than, < less than, >= greater than or equal to, and <= less than or equal to comparison operators. With an understanding of these operators, you can write effective SQL queries to filter data based on specific conditions.