Table: awahono_school_grey_valley
Columns: name
years
area
authority
decile
roll

Question: With what Name does the Roll of 637 belong?
SQL: SELECT "name" FROM awahono_school_grey_valley WHERE "roll" = '637'

Question: Which is the Authority that has a Roll of 70?
SQL: SELECT "authority" FROM awahono_school_grey_valley WHERE "roll" = '70'

Question: The Decile of 6 has which corresponding Years?
SQL: SELECT "years" FROM awahono_school_grey_valley WHERE "decile" = '6'