Is this a good idea to store relations to many different tables in one field?
47564
Foreign Key column mapped to multiple primary keys
33176
Can I have multiple primary keys in a single table?
155109
Foreign key constraint may cause cycles or multiple cascade paths?
112466
Concatenate one-to-many field in single result?
59362
Flatten / collapse one-to-many table and keep the 'many' attributes separate
158985
Can a foreign key be NULL and/or duplicate?
84126
Database design - many-to-many relationship between three columns
5603
Summary table with a field that shows components of each summarized record
139603
Doctrine2: Best way to handle many-to-many with extra columns in reference table
77288
many-to-many relationship in database design
70261
How to create a flexible table schema for storing messages from different chats?
39449
Database Design Best Practices
133288
Using Foreign Key and References for ON DELETE CASCADE in mysql
9555
MySQL how to join tables on two fields
11985
A beginner's guide to SQL database design
43036
How to organically merge nested associations?
26481
Many To Many Relationships