ClickHouse/docs/en/sql_reference/functions/comparison_functions.md
2020-04-03 16:23:32 +03:00

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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.
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.
## equals, a = b and a == b operator {#function-equals}
## notEquals, a ! operator= b and a <> b {#function-notequals}
## less, < operator {#function-less}
## greater, > operator {#function-greater}
## lessOrEquals, <= operator {#function-lessorequals}
## greaterOrEquals, >= operator {#function-greaterorequals}
[Original article](https://clickhouse.tech/docs/en/query_language/functions/comparison_functions/) <!--hide-->