question: What is No. 5, when No. 2 is Olivia, when No. 4 is Ava, and when No. 6 is Abigail?
answer: SELECT no_5 FROM table_name_39 WHERE no_2 = "olivia" AND no_4 = "ava" AND no_6 = "abigail"
context: CREATE TABLE table_name_39 (no_5 VARCHAR, no_6 VARCHAR, no_2 VARCHAR, no_4 VARCHAR)