Attach, detach and sync many-to-many relationships in Laravel

1.attach is insert value to pivot table relation

when we run this code $user->roles()->attach([3]); that will be add/insert data to table user_role

role_id	user_id
3	1

2.sync is add value and delete to pivot table relation

If user_role table have

role_id	user_id
1	1
2	1

// run this syntax
$user->roles()->sync([3, 2])

role_id	user_id
2	1
3	1

3. detach is remove value in pivot table relation

If we have data like this

role_id	user_id
2	1
3	1
1	1

when we try to run this code $user->roles()->detach(); that will be remove all data, but if we add the arguments on function detach $user->roles()->detach(1); will remove only role_id : 1

role_id	user_id

4. syncWithoutDetaching is add value without detach and duplicate when run twice

Let say we have table with value like this

role_id	user_id
3	1

when we insert using code syncWithoutDetaching example $user->roles()->syncWithoutDetaching([1, 2]); will be insert value role_id 1 and 2

role_id	user_id
3	1
1	1
2	1