Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Students_in_Detention ( student_id VARCHAR )

### Question ###
How many distinct students have been in detention?

### Accurate SQL ###

SELECT COUNT(DISTINCT student_id) FROM Students_in_Detention