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_1137703_2 ( round VARCHAR, grand_prix VARCHAR )

### Question ###
Which round was the Spanish Grand Prix?

### Accurate SQL ###

SELECT round FROM table_1137703_2 WHERE grand_prix = "Spanish grand_prix"