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Unless the tables User, Team, Group have a common "parent" table which their PK come from, inheritancy in database basically. But yes that's definitively a good point.

Walfrat
– Walfrat

2016-11-17 13:20:14 +00:00
Commented Nov 17, 2016 at 13:20
@Walfrat no the parent tables are different

Faizan Hasan
– Faizan Hasan

2016-11-17 13:23:58 +00:00
Commented Nov 17, 2016 at 13:23
@Walfrat: this isn't something supported by commonly used RDMS such as Microsoft SQL Server or PostgreSQL, is it? Also, how would one know that the FK points to the user 123, and not a team or a group with the same ID?

Arseni Mourzenko
– Arseni Mourzenko

2016-11-17 13:25:03 +00:00
Commented Nov 17, 2016 at 13:25
@ArseniMourzenko this is exactly how inheritancy works with ORM. Child tables have a primary key which is also a foreign key which point to the parent table. Which mean when you need to create a new object, you need first to create the entry in the parent table, keep the id given (either from last_insert_id() or using a sequence and keep the value) and put it in the child table. This mean ther eis no duplicate id between child tables.

Walfrat
– Walfrat

2016-11-17 13:28:35 +00:00
Commented Nov 17, 2016 at 13:28
@Walfrat: oh, I see now what you were talking about.

Arseni Mourzenko
– Arseni Mourzenko

2016-11-17 13:29:48 +00:00
Commented Nov 17, 2016 at 13:29

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