更好的mysql选择Query来过滤数据（PHP）

Question

I am having a problem where i want to search data from my mysql database , this is how it goes i have a search field where a user enters location name and then i search for that location in my database and display the username based on searched location but i have some users which have more than one location in the database separated with a "comma" so my select query is not able to find, this is how my database looks

 table name :- users 

 username ||  location

 john    ||  KIS,ITS

 alex   || KIS

So when someone is searching for KIS it is only showing alex name not john's though he is a part of KIS aswell , i am wondering if there is any better query that can solve my problem

Thanks

Answer 1

Updated query for new question requirements

Works for

KIS

KIS,(anything) at start

(anything),KIS,(anything) at middle

(anything),KIS at last

Query

SELECT * 
FROM users
WHERE location = 'KIS' OR LIKE 'KIS,%' OR LIKE '%,KIS,%' OR LIKE '%,KIS' 

Answer 2

If you need to find a part of input string you could use

SELECT * FROM users WHERE location LIKE '%KIS%'

If you need to get correct input you can use

SELECT * FROM users
WHERE FIND_IN_SET(LOWER('KIS'), LOWER(location)) > 0

Answer 3

select username from users where location like '%KIS%'

Answer 4

Use regular expressions.

SELECT * FROM users WHERE location RLIKE '(^|[^_alnum])KIS($|[^_alnum])'

Or if your data is always separated by one comma, then use this:

SELECT * FROM users WHERE location RLIKE '(^|,)KIS($|,)'

But know that your database is not in 1st normal form, and storing complex data, and looking it up is going to greatly affect performance. If it's possible use a separate table to store the location for each user.