Table: dragons_den_appearances
Columns: seat
series_1
series_2
series_3
series_4

Question: What shows for series 4 when the seat shows 1?
SQL: SELECT "series_4" FROM dragons_den_appearances WHERE "seat" = 1

Question: What is the seat number when Series 3 shows Dana Bérová?
SQL: SELECT AVG("seat") FROM dragons_den_appearances WHERE "series_3" = 'dana bérová'