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_40223 ( "Date" text, "Tournament" text, "Winning score" text, "Margin of victory" text, "Runner(s)-up" text )

### Question ###
What is Winning Score, when Tournament is Joburg Open 1, and when Date is 17 Jan 2010?

### Accurate SQL ###

SELECT "Winning score" FROM table_40223 WHERE "Tournament" = 'joburg open 1' AND "Date" = '17 jan 2010'