<分区>
SELECT t1.Type,
FROM PERFORMS_SURGERY AS PS
INNER JOIN
(SELECT CPT, Type FROM SURGERY) as t1
ON t1.CPT = PS.CPT
WHERE PS.PUsername = "klove30"
我在“FROM PERFORMS_SURGERY AS PS”处收到语法错误 内部联接 (SELECT CPT, Type FROM SURGERY)”。语法错误是什么？