CREATE TABLE table_69063 ("Call sign" TEXT, "Frequency MHz" FLOAT, "City of license" TEXT, "ERP W" TEXT, "Class" TEXT, "FCC info" TEXT)

Which call sign has a Class of A, and a Frequency MHz of 88.7?
SELECT "Call sign" FROM table_69063 WHERE "Class" = 'a' AND "Frequency MHz" = '88.7'
SELECT "Call sign" FROM "table_69063" WHERE "Class" = 'a' AND "Frequency MHz" = '88.7'