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_23927423_4 ( promoted_to_league VARCHAR, relegated_to_league VARCHAR )

### Question ###
Who was promoted to the league when Coventry was relegated to the league?

### Accurate SQL ###

SELECT promoted_to_league FROM table_23927423_4 WHERE relegated_to_league = "Coventry"