Table schema:
CREATE TABLE ENROLLED_IN (Grade VARCHAR, StuID VARCHAR); CREATE TABLE STUDENT (Fname VARCHAR, StuID VARCHAR); CREATE TABLE GRADECONVERSION (gradepoint VARCHAR, lettergrade VARCHAR)

Question: Find the distinct student first names of all students that have grade point at least 3.8 in one course.
SQL: SELECT DISTINCT T3.Fname FROM ENROLLED_IN AS T1 JOIN GRADECONVERSION AS T2 JOIN STUDENT AS T3 ON T1.Grade = T2.lettergrade AND T1.StuID = T3.StuID WHERE T2.gradepoint >= 3.8