Question

I have a table named config. Each config row has a list of services tied to it.
There are a total of 10 specific services available.

How should I design the schema? The config schema already exists.
This is my idea, but not sure if it is the right way.

config
===================
config_id primary key  
col-1  
col-2  
...  
col-n

I am planning to introduce a new table.

serviceconfigmap 
======================================== 
config-id # foreign key to config table  
svc_id    # service identifier

The problem with this approach is that, the serviceconfigmap table will duplicate the svc_id column for each config-id

Is this the right approach? Any better idea is welcome

========================================

EDIT

I understand that I incorrectly termed my requirement as One-to-Many instead of Many-to-Many. Edited my question.

Each config can have multiple services and same servoce can be shared among different configs.

Answer 1

You are designing for Many-To-Many relationship, since config has many services and services can contain on different config.

You need to have three tables for this, Config, Service and MappingTable

Config
=========
Config_ID         => unique
Config_Name
.....

Service
=========
Service_ID        => unique
Service_Name
.....

ConfigServiceMap
==================
Config_ID         
Service_ID
.....