CREATE TABLE table_204_564 (id NUMBER, "devanagari" CLOB, "iso 15919" CLOB, "unrsgn" CLOB, "iast" CLOB, "comment" CLOB)

what unrsgn is listed previous to the o ?
SELECT "unrsgn" FROM table_204_564 WHERE id = (SELECT id FROM table_204_564 WHERE "unrsgn" = 'o') - 1
SELECT "unrsgn" FROM "table_204_564" WHERE "id" = (SELECT "id" FROM "table_204_564" WHERE "unrsgn" = 'o') - 1