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_30317 ( "Year Location" text, "Mens Singles" text, "Womens Singles" text, "Mens Doubles" text, "Womens Doubles" text )

### Question ###
In what year and location did Liu Guozheng win the Mens Singles?

### Accurate SQL ###

SELECT "Year Location" FROM table_30317 WHERE "Mens Singles" = 'Liu Guozheng'