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33 lines
1.2 KiB
Markdown
33 lines
1.2 KiB
Markdown
# 比较函数 {#bi-jiao-han-shu}
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比较函数始终返回0或1（UInt8）。
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可以比较以下类型：
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- Numbers
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- String 和 FixedString
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- Date
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- DateTime
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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。
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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。
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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。
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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。
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## equals, a = b and a == b operator {#equals-a-b-and-a-b-operator}
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## notEquals, a ! operator= b and a `<>` b {#notequals-a-operator-b-and-a-b}
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## less, `< operator` {#less-operator}
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## greater, `> operator` {#greater-operator}
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## lessOrEquals, `<= operator` {#lessorequals-operator}
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## greaterOrEquals, `>= operator` {#greaterorequals-operator}
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[来源文章](https://clickhouse.tech/docs/en/query_language/functions/comparison_functions/) <!--hide-->
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