如何在SQL Server中比较Unicode字符? [英] How to compare Unicode characters in SQL server?

问题描述

我正在尝试通过执行以下查询来查找数据库(SQL Server)中文本中具有字符é的所有行.

Hi I am trying to find all rows in my database (SQL Server) which have character é in their text by executing the following queries.

SELECT COUNT(*) FROM t_question WHERE patindex(N'%[\xE9]%',question) > 0;

SELECT COUNT(*) FROM t_question WHERE patindex(N'%[\u00E9]%',question) > 0;

但是我发现了两个问题:(a)他们两个都返回不同数量的行，并且(b)他们都返回没有指定字符的行.

But I found two problems: (a) Both of them are returning different number of rows and (b) They are returning rows which do not have the specified character.

构造正则表达式并比较Unicode正确吗?

Is the way I am constructing the regular expression and comparing the Unicode correct?

问题列使用数据类型nvarchar存储. 但是，以下查询给出了正确的结果.

The question column is stored using datatype nvarchar. The following query gives the correct result though.

SELECT COUNT(*) FROM t_question WHERE question LIKE N'%é%';

推荐答案

为什么不使用SELECT COUNT(*) FROM t_question WHERE question LIKE N'%é%'?

NB:Like和patindex不不接受正则表达式.

NB: Likeand patindex do not accept regular expressions.

在SQL Server模式语法中，[\xE9]表示匹配指定集合中的任何单个字符.即匹配\，x，E或9.因此，以下任何字符串都将匹配该模式.

In the SQL Server pattern syntax [\xE9] means match any single character within the specified set. i.e. match \, x, E or 9. So any of the following strings would match that pattern.

• 大象"
• 轴"
• "99.9"

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