how to get user name based on id separated by comma in single table

Question

user_id   user_name        user_friend_list
1         dharmendra       2,3,4,5,6,7
2         jitendra         1,3,4,5,6,7
3         xyz              1,2,6,7 
4         pqr              1,3,4 

now i want to extract user_id & user name based on user_friend_list id 6 ie it will return 1,2,3 user_id & user name dharmendra jitendra and xyz.

i simply use splite function of php but it is so complicated please provide me well shortcut method

thanks & regards

Answer 1

You can use FIND_IN_SET()

select user_id, user_name
from your_table
where find_in_set(6, user_friend_list) > 0

But it would actually be better to change your table design. Never store multiple values in one column!

Answer 2

first thing the table is not normalized that's why the problem exist you must break this table like this or better :)

table 1
user_id
user_name

table 2
user_id
friend_id

table 2 will have some redundant data though which can be removed by adding a third table as a mapping between table1 and table2

now you can have the following query to get the result

select user_id,user_name from table1 as a join table2 as b on a.user_id=b.user_id where b.friend_id=6;

Answer 3

“从表中选择user_id，用户名，其中user_id IN（2,3,4,5,6,7）”；