question: yes or no for the sydney with yes for melbourne, no for perth, no for auckland and no for gold coast?
answer: SELECT sydney FROM table_name_43 WHERE melbourne = "yes" AND perth = "no" AND auckland = "no" AND gold_coast = "no"
context: CREATE TABLE table_name_43 (sydney VARCHAR, gold_coast VARCHAR, auckland VARCHAR, melbourne VARCHAR, perth VARCHAR)