CREATE TABLE table_23915973_1 (frequency VARCHAR2, branding VARCHAR2)

What is the frequency when radio station branding is 106.3 energy fm naga?
SELECT frequency FROM table_23915973_1 WHERE branding = "106.3 Energy FM Naga"
SELECT "frequency" FROM "table_23915973_1" WHERE "106.3 Energy FM Naga" = "branding"