问题描述
这是包含我的 skills
C,C++
P,H,D
ASP,.net,C,C#,C++,R+
C++
我需要找到所有包含 C
的条目.所以我使用 Skills LIKE ('%'+@Skill+'%')
格式化了一个查询,当我只想得到结果时,这给了我所有条目,包括 C++
C
单独的.
I need to find all entries that contain C
. So I formatted a query by using Skills LIKE ('%'+@Skill+'%')
and this gives me all entries including C++
when I just want to get the result of C
alone.
从上面的例子中搜索,我只能得到 C,C++
和 ASP, .net, C, C#, C++, R+
行.我不能得到 C++
- 结果集中的最后一行.
Searching from the above example, I must only get C,C++
and ASP, .net, C, C#, C++, R+
rows. I must not get C++
- last row in the resultset.
我的要求是,在搜索 C
而不是 C++
时,我只需要获取 C
.如何格式化此类查询?
My requirement is that I need to get only C
when searching for C
and not C++
. How do I format such a query?
我正在使用存储过程来执行所有查询.
I am using stored procedures to execute all the queries.
推荐答案
可以根据这些条件进行过滤
You can filter based on these conditions
如果搜索技能是列中的第一个技能
Skills LIKE @Skill +',%'
如果搜索技能位于中间Skills LIKE '%,'+ @Skill+',%'
如果搜索技能在最后Skills LIKE '%,' + @Skill
如果搜索技能是唯一的技能 Skills = @Skill
if search skill is the only skill Skills = @Skill
查询
SELECT ...
WHERE Skills LIKE '%,'+ @Skill+',%'
OR Skills LIKE @Skill +',%'
OR Skills LIKE '%,' + @Skill
OR Skills = @Skill
编辑
另一个较短的查询可以是
Another shorter query can be
SELECT ...
WHERE ',' + Skills + ',' LIKE '%,'+ @Skill+',%'
注意::您可能会遇到此类设计和查询的性能问题.如果可能,请考虑创建一个技能表来保存用户的所有技能.请参阅 Zohar Peled 关于如何改进您的设计的回答
Note:: You may face performance issues with such a design and query. If possible look into creating a skills table to hold all skills for a user. Please see Zohar Peled's answer on how to improve your design
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