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 concert (stadium_id VARCHAR, capacity VARCHAR)
TABLE: CREATE TABLE stadium (stadium_id VARCHAR, capacity VARCHAR)

### Question ###
Find the number of concerts happened in the stadium with the highest capacity .

### Accurate SQL ###

SELECT COUNT(*) FROM concert WHERE stadium_id = (SELECT stadium_id FROM stadium ORDER BY capacity DESC LIMIT 1)