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 table_1137704_2 (round INTEGER, grand_prix VARCHAR)

### Question ###
whatthe minimum round where grand prix is german grand prix

### Accurate SQL ###

SELECT MIN(round) FROM table_1137704_2 WHERE grand_prix = "German grand_prix"