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_39563 ( "Role" text, "D'Oyly Carte 1920 Tour" text, "D'Oyly Carte 1930 Tour" text, "D'Oyly Carte 1939 Tour" text, "D'Oyly Carte 1945 Tour" text, "D'Oyly Carte 1950 Tour" text )

### Question ###
D'Oyly Carte 1939 Tour of richard walker involves what D'Oyly Carte 1945 Tour?

### Accurate SQL ###

SELECT "D'Oyly Carte 1945 Tour" FROM table_39563 WHERE "D'Oyly Carte 1939 Tour" = 'richard walker'