# Comparative Expressions*This section covers everything you need to know about using comparative expressions to compare two (string or number) concepts. It also gives you example knowledge maps so you can explore comparative expressions inside the Rainbird Studio.*

**Comparative expressions** are functions that **compare 2 variables or constants, **and can be used to compare** string or number type concepts. **Comparative expression functions are built inside “expressions” when creating a rule, normally with the following formula:

**%VARIABLE_1 comparative_expression %VARIABLE_2**

Click on a comparative expression below for more information:

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*This section covers everything you need to know about using comparative expressions to compare two (string or number) concepts. It also gives you example knowledge maps so you can explore comparative expressions inside the Rainbird Studio.*

**Comparative expressions** are functions that **compare 2 variables or constants, **and can be used to compare** string or number type concepts. **Comparative expression functions are built inside “expressions” when creating a rule, normally with the following formula:

**%VARIABLE_1 comparative_expression %VARIABLE_2**

Click on a comparative expression below for more information:

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**Subtopics**

Build comparative expressions

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is equal to / is equal / equal / equals

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is not equal to / does not equal

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greater than / is greater than / gt

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less than / is less / lt

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greater than or equal to / gte

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less than or equal to / lte

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Comparative Expressions - Downloadable Model

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