Design sql tables with list of foreign keys - sql

Question

I want to create an application for rotating pairs in a team every day. I need to store this in the database. Requirments are:
A team should be assigned to one ore more members.
Each team can have multiple tabs and different members allocate in them.(If team consist of 4 members for the particular tab only 3 should be part of it)
Each tab will have a pair of members or list of pairs per day stored.
I have ended up designing something like the example below:
create table if not exists team (
id serial not null primary key,
name text not null
);
create table if not exists member (
id serial not null primary key,
team_id integer references team(id),
nickname text
);
create table if not exists team_tab (
id bigserial not null primary key,
team_id integer references team(id) on delete cascade,
name text not null,
member_ids integer[],
);
create table if not exists team_tab_pairs (
id bigserial not null primary key,
team_tab_id integer not null references team_tab(id) on delete cascade,
tab_date date not null,
pair_ids integer[][],
);
I need an advice and suggestions how could I achieve this without having a list of references ids stored in the 2 tables below.

Answer 1

You need an extra table to design an M:N relationship. This is the case, for example, between "team tab" and "member". In addition to both main entities:
create table member (
id serial not null primary key,
team_id integer references team(id),
nickname text
);
create table team_tab (
id bigserial not null primary key,
team_id integer references team(id) on delete cascade,
name text not null
);
...you'll need to create a table to represent the M:N relationship, as in:
create table team_tab_member (
team_tab_id bigint not null,
member_id int not null,
primary key (team_tab_id, member_id) -- optional depending on the model
);