Table: stw_1998_season
Columns: round
race
circuit
date
event
winning_driver

Question: What shows for round when the race was Int. Adac Preis Von Zweibrücken?
SQL: SELECT "round" FROM stw_1998_season WHERE "race" = 'int. adac preis von zweibrücken'

Question: What is the round for the Norisring circuit?
SQL: SELECT AVG("round") FROM stw_1998_season WHERE "circuit" = 'norisring'

Question: What race was a round smaller than 8,  on 6 july?
SQL: SELECT "race" FROM stw_1998_season WHERE "round" < 8 AND "date" = '6 july'

Question: What is the round for the Int. Adac-Preis Der Tourenwagen Von Sachsen-Anhalt?
SQL: SELECT "round" FROM stw_1998_season WHERE "race" = 'int. adac-preis der tourenwagen von sachsen-anhalt'