CREATE TABLE news_report (journalist_ID INT, Event_ID INT, Work_Type TEXT)
CREATE TABLE event (Event_ID INT, Date TEXT, Venue TEXT, Name TEXT, Event_Attendance INT)
CREATE TABLE journalist (journalist_ID INT, Name TEXT, Nationality TEXT, Age TEXT, Years_working INT)

Return me a bar chart to show the average experience working length of journalists working on different role type, list by the Y-axis from low to high.
SELECT Work_Type, AVG(Years_working) FROM journalist AS t1 JOIN news_report AS t2 ON t1.journalist_ID = t2.journalist_ID GROUP BY t2.Work_Type ORDER BY AVG(Years_working)
SELECT "Work_Type", AVG("Years_working") FROM "journalist" AS "t1" JOIN "news_report" AS "t2" ON "t1"."journalist_ID" = "t2"."journalist_ID" GROUP BY "t2"."Work_Type" ORDER BY AVG("Years_working") NULLS FIRST