CREATE TABLE table_38627 ("Call sign" TEXT, "Frequency MHz" TEXT, "City of license" TEXT, "ERP W" FLOAT, "Class" TEXT, "FCC info" TEXT)

What is the frequency of Walterboro, SC?
SELECT "Frequency MHz" FROM table_38627 WHERE "City of license" = 'walterboro, sc'
SELECT "Frequency MHz" FROM "table_38627" WHERE "City of license" = 'walterboro, sc'