CREATE TABLE ENROLLED_IN (Grade VARCHAR(255), StuID VARCHAR(255)); CREATE TABLE STUDENT (Fname VARCHAR(255), StuID VARCHAR(255)); CREATE TABLE GRADECONVERSION (gradepoint VARCHAR(255), lettergrade VARCHAR(255))
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