在数据库中创建新列或创建新表

Question

I have a dataBase with table schedule and many data with this properties like id title type description and foreigns keys called day_id event_id

The day_id make a relationship with table schedule_day that contains the property id and date

What's the best design and performance search for this two cases:

1- Keep different tables, a table day and a table schedule with foreign key to day

or

2- Create a column date in schedule table e remove the shedule_day table

Answer 1

If schedule_day contains only two columns and has no chance to add column in future then it should be replaced by adding one column into schedule table.

In terms of performance, join of two table require time.