CREATE TABLE Students (student_id VARCHAR2, personal_name VARCHAR2)
CREATE TABLE Student_Course_Enrolment (date_of_enrolment VARCHAR2, date_of_completion VARCHAR2, student_id VARCHAR2)

List the dates of enrollment and completion of the student with personal name 'Karson'.
SELECT T1.date_of_enrolment, T1.date_of_completion FROM Student_Course_Enrolment AS T1 JOIN Students AS T2 ON T1.student_id = T2.student_id WHERE T2.personal_name = "Karson"
SELECT "T1"."date_of_enrolment", "T1"."date_of_completion" FROM "Student_Course_Enrolment" "T1" JOIN "Students" "T2" ON "Karson" = "T2"."personal_name" AND "T1"."student_id" = "T2"."student_id"