CREATE TABLE table_204_268 (id NUMBER, "album/single" CLOB, "performer" CLOB, "year" NUMBER, "variant" CLOB, "notes" CLOB)

which album has the same name as its performer ?
SELECT "album/single" FROM table_204_268 WHERE "album/single" = "performer"
SELECT "album/single" FROM "table_204_268" WHERE "album/single" = "performer"