MySQL語法錯誤（加入表）

Question

任何人都可以告訴我這種語法錯誤是什麼？

SELECT crew_no AS Crew_No, concat(last_name, ', ', first_name, ' ', mi) AS Crew_Name, pos_name AS Position, vesname AS Vessel, 
FROM (
(
mastertb 
JOIN positiontb ON (positiontb.pos_code = mastertb.pos_code) 
) 
JOIN vesseltb ON (vesseltb.vescode = mastertb.vescode) 
) 
ORDER BY crew_no 
LIMIT 0 , 30 

Answer 1

... AS Vessel, FROM ... 

你不應該之前，有一個逗號。