Table: pinoy_big_brother_teen
Columns: task_no
day_announced
options
viewers_selection
result

Question: What were the options that were completed before the 4 th task that had viewers selecting nan?
SQL: SELECT "options" FROM pinoy_big_brother_teen WHERE "result" = 'completed' AND "task_no" < 4 AND "viewers_selection" = 'nan'

Question: when was it announced that the viewers selected robi out of alex, ejay, nan, robi?
SQL: SELECT "day_announced" FROM pinoy_big_brother_teen WHERE "viewers_selection" = 'robi' AND "options" = 'alex, ejay, nan, robi'

Question: What day was it when viewers selected ejay?
SQL: SELECT "day_announced" FROM pinoy_big_brother_teen WHERE "viewers_selection" = 'ejay'