CREATE TABLE table_58187 ("Name" TEXT, "Years" TEXT, "Area" TEXT, "Authority" TEXT, "Decile" TEXT, "Roll" FLOAT)

Which school has a state authority and a roll of 318?
SELECT "Name" FROM table_58187 WHERE "Authority" = 'state' AND "Roll" = '318'
SELECT "Name" FROM "table_58187" WHERE "Authority" = 'state' AND "Roll" = '318'