ClickHouse/docs/en/sql-reference/functions/comparison-functions.md

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---
toc_priority: 36
toc_title: Comparison
---
# Comparison Functions {#comparison-functions}
Comparison functions always return 0 or 1 (Uint8).
The following types can be compared:
- numbers
- strings and fixed strings
- dates
- dates with times
within each group, but not between different groups.
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For example, you cant compare a date with a string. You have to use a function to convert the string to a date, or vice versa.
Strings are compared by bytes. A shorter string is smaller than all strings that start with it and that contain at least one more character.
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## equals, a = b and a == b operator {#function-equals}
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## notEquals, a != b and a \<\> b operator {#function-notequals}
## less, \< operator {#function-less}
## greater, \> operator {#function-greater}
## lessOrEquals, \<= operator {#function-lessorequals}
## greaterOrEquals, \>= operator {#function-greaterorequals}
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[Original article](https://clickhouse.tech/docs/en/query_language/functions/comparison_functions/) <!--hide-->