CREATE TABLE table_name_93 (exponent_field VARCHAR, exp__biased_ VARCHAR, value VARCHAR)

What's the exponent field that has 255 exp and value of + ?
SELECT exponent_field FROM table_name_93 WHERE exp__biased_ = "255" AND value = "+∞"
SELECT "exponent_field" FROM "table_name_93" WHERE "+∞" = "value" AND "255" = "exp__biased_"