Table: whoseline_episodes_3
Columns: date
episode
performer_1
performer_2
performer_3
performer_4

Question: Performer 3 of paul merton, and a Performer 4 of sandi toksvig is which performer 1?
SQL: SELECT "performer_1" FROM whoseline_episodes_3 WHERE "performer_3" = 'paul merton' AND "performer_4" = 'sandi toksvig'

Question: Episode of 16 involves which performer 1?
SQL: SELECT "performer_1" FROM whoseline_episodes_3 WHERE "episode" = 16

Question: Performer 2 of compilation 1 had what performer 1?
SQL: SELECT "performer_1" FROM whoseline_episodes_3 WHERE "performer_2" = 'compilation 1'