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_1947 ( "Period" text, "Kit manufacturer" text, "Main sponsor" text, "Secondary sponsor" text, "Minor sponsors" text )

### Question ###
When ale is the main sponsor who is the secondary sponsor?

### Accurate SQL ###

SELECT "Secondary sponsor" FROM table_1947 WHERE "Main sponsor" = 'Ale'