ClickHouse/docs/zh/query_language/functions/comparison_functions.md
Ivan Blinkov 2e1f6bc56d
[experimental] add "es" docs language as machine translated draft (#9787)
* replace exit with assert in test_single_page

* improve save_raw_single_page docs option

* More grammar fixes

* "Built from" link in new tab

* fix mistype

* Example of include in docs

* add anchor to meeting form

* Draft of translation helper

* WIP on translation helper

* Replace some fa docs content with machine translation

* add normalize-en-markdown.sh

* normalize some en markdown

* normalize some en markdown

* admonition support

* normalize

* normalize

* normalize

* support wide tables

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* normalize

* lightly edited machine translation of introdpection.md

* lightly edited machhine translation of lazy.md

* WIP on translation utils

* Normalize ru docs

* Normalize other languages

* some fixes

* WIP on normalize/translate tools

* add requirements.txt

* [experimental] add es docs language as machine translated draft

* remove duplicate script

* Back to wider tab-stop (narrow renders not so well)
2020-03-21 07:11:51 +03:00

1.2 KiB
Raw Blame History

比较函数

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

notEquals, a ! operator= b and a <> b

less, < operator

greater, > operator

lessOrEquals, <= operator

greaterOrEquals, >= operator

来源文章