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_79821 ( "Sydney" text, "Melbourne" text, "Perth" text, "Adelaide" text, "Gold Coast" text, "Auckland" text )

### Question ###
what is the Sydney that has Adelaide, Gold Coast, Melbourne, and Auckland are all yes?

### Accurate SQL ###

SELECT "Sydney" FROM table_79821 WHERE "Adelaide" = 'yes' AND "Gold Coast" = 'yes' AND "Melbourne" = 'yes' AND "Auckland" = 'yes'