查询带有单个ID列的逗号分隔列？

Question

I am trying to get a result where a single column id is like a comma separated columns, my two table are as follows:

Room Location Table

Events Table

User Table

My query is

$sql=" SELECT users.*, events.*, room_location.* 
       FROM   events 
           INNER JOIN room_location ON events.event_room = room_location.location 
           INNER JOIN users ON room_location.user_loc_id = users.userlocationaccess 
       WHERE  room_location.user_loc_id LIKE '%1,2%'";

$result = $conn->query($sql);

The query above works if I use single id in in the users->userGroupLocID.

How do I amend my query to work so it find if the id is like my comma separated columns?

Answer 1

You can search a CSV field using FIND_IN_SET(str,strlist) function.

Example :

mysql> SELECT FIND_IN_SET('b','a,b,c,d');
    -> 2

Documentation Says :

Returns a value in the range of 1 to N if the string str is in the string list strlist consisting of N substrings. A string list is a string composed of substrings separated by “,” characters.

You can pass users location id to find in the column userGroupLocID

select find_in_set( location_id_in_search, replace( userGroupLocID, ' ', '' ) )
  from table_name;