布尔表SQL的最佳方法

Question

I want to store the current situation of a patient

• Entry
• In Body Treatment
• High Medical

What would be the best approach to store a boolean table like this?

I was thinking

ID_STATUS   INT
ID_PATIENT  INT 
ENTRY       BOOL
BODY_TREATMENT  BOOL
HIGH_MEDICAL    BOOL

Is this a good approach or only a table like the following is needed ?

ID_STATUS         INT
ID_PATIENT        INT
CURRENT_STATUS    VARCHAR

Answer 1

Store your CURRENT_STATUS possibilities in a lookup table. You can use a surrogate key or not. This is personal preference but should probably follow what the rest of the database looks like.

Boolean columns are somewhat of a code smell. "Flags" like this can often be refactored into better relational structures. In your case, would it make sense if two statuses were true at the same time?

Answer 2

If you don't care about when one situation stops and the next one starts, all you need is:

id_patient
id_situation

That's an oversimplification of course, because a patient can have more than one visit and each visit would have it's own situation.