CREATE TABLE table_204_301 (id NUMBER, "nationality" CLOB, "name" CLOB, "term as a deputy judge" CLOB, "reason for termination" CLOB)

what is the total number of years that frederik beichmann was a deputy judge ?
SELECT "term as a deputy judge" - "term as a deputy judge" FROM table_204_301 WHERE "name" = 'frederik beichmann'
SELECT "term as a deputy judge" - "term as a deputy judge" FROM "table_204_301" WHERE "name" = 'frederik beichmann'