Question: Which authority had a role of 651?
SQL: SELECT "Authority" FROM "2-12017602-20" WHERE "Roll" = 651.0;

Question: For the roll of 651, what was the lowest Decile?
SQL: SELECT MIN("Decile") FROM "2-12017602-20" WHERE "Roll" = 651.0;

Question: What were the years for Redhill School, authority of State?
SQL: SELECT "Years" FROM "2-12017602-20" WHERE "Authority" = 'State' AND "Name" = 'Redhill School';

Question: What was the sum roll of Karaka area?
SQL: SELECT SUM("Roll") FROM "2-12017602-20" WHERE "Area" = 'Karaka';