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_20183474_1 ( oil_rig VARCHAR, place VARCHAR )

### Question ###
What's the oil rig of the song that ended on 7th place?

### Accurate SQL ###

SELECT oil_rig FROM table_20183474_1 WHERE place = "7th"