如何在 sql 服务器查询中使用通配符

Question

在 SQL 服务器中执行 select 时，我可以在查询文本的开头或结尾放置一个 % 以指示我想要其他文本的任意数量的字符，但我不确定中间怎么办。

例如我想要 SQL 如下所示，

select *
From Table
Where name like '%[Error] Something failed in (%) session%'

当运行与以下数据相对时

Row | Date      | Log Message
1   |2016-01-01 |'[Error] Something failed in (Freds) session'
2   |2016-01-01 |'[Error] Something failed in (Ilenes) session'
3   |2016-01-01 |'[Error] Something failed in (Freds) session'; Some other warning
4   |2016-01-01 |'[Warning] Something else went wrong'
5   |2016-01-01 |'[Warning] Some other warning'

会给我

Row |Date       | Log Message
1   |2016-01-01 |'[Error] Something failed in (Freds) session'
2   |2016-01-01 |'[Error] Something failed in (Ilenes) session'
3   |2016-01-01 |'[Error] Something failed in (Freds) session'; Some other warning

但是它没有任何回报，我需要改变什么。

Answer 1

问题是由于字符串中存在 []。 [] 与 LIKE 运算符一起使用以查找

any single character within the specified range ([a-f]) or set ([abcdef]).

所以你需要 ESCAPE 方括号的

select 1 
where '[Error] Something failed in (Freds) session'
like '%\[Error] Something failed in (%) session%' escape '\'

或

select 1 
where '[Error] Something failed in (Freds) session'
like '%[[]Error] Something failed in (%) session%'

SQL FIDDLE DEMO

如何在 sql 服务器查询中使用通配符

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