ClickHouse/docs/zh/query_language/functions/comparison_functions.md
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# 比较函数 {#bi-jiao-han-shu}
比较函数始终返回0或1UInt8
可以比较以下类型:
- Numbers
- String 和 FixedString
- Date
- DateTime
以上每个组内的类型均可互相比较,但是对于不同组的类型间不能够进行比较。
例如,您无法将日期与字符串进行比较。您必须使用函数将字符串转换为日期,反之亦然。
字符串按字节进行比较。较短的字符串小于以其开头并且至少包含一个字符的所有字符串。
注意。直到1.1.54134版本有符号和无符号数字的比较方式与C++相同。换句话说在SELECT 9223372036854775807 gt; -1 等情况下,您可能会得到错误的结果。 此行为在版本1.1.54134中已更改,现在在数学上是正确的。
## equals, a = b and a == b operator {#equals-a-b-and-a-b-operator}
## notEquals, a ! operator= b and a `<>` b {#notequals-a-operator-b-and-a-b}
## less, `< operator` {#less-operator}
## greater, `> operator` {#greater-operator}
## lessOrEquals, `<= operator` {#lessorequals-operator}
## greaterOrEquals, `>= operator` {#greaterorequals-operator}
[来源文章](https://clickhouse.tech/docs/en/query_language/functions/comparison_functions/) <!--hide-->