存储过程编译，PLS-00103错误，请指点！！

[goodisme]

编译错误：
PLS-00103: 出现符号 "SELECT"在需要下列之一时 <an identifier><a double-quoted delimited-identifier>

错误语句：

UPDATE b
SET minitqty =
( minitqty
+ (SELECT trxqtysum ---报错行
FROM a
WHERE b.wno = a.wno
AND b.mcd = a.mcd
AND TRIM (b.wno) = TRIM (vs_wno))
)
WHERE EXISTS (
SELECT 'X'
FROM a
WHERE b.wno = a.wno
AND b.mcd = a.mcd
AND TRIM (b.wno) = TRIM (vs_wno));

说明：其中wno，mcd为a表的主键，确定a表唯一记录行。

[goodisme]

另外说明，，这个在9i下编译没有问题的，而在8.1.6下就会出现这样的错误，

请高手指点！！！

[wiler]

UPDATE b
SET minitqty =
(SELECT trxqtysum+b.minitqty
FROM a
WHERE b.wno = a.wno
AND b.mcd = a.mcd
AND TRIM (b.wno) = TRIM (vs_wno)
)
WHERE EXISTS (
SELECT 'X'
FROM a
WHERE b.wno = a.wno
AND b.mcd = a.mcd
AND TRIM (b.wno) = TRIM (vs_wno));

[sten]

楼主，楼上的可以了吗

[Eric_1999]

UPDATE b
SET b.minitqty =
( (SELECT trxqtysum+b.minitqty ---报错行
FROM a
WHERE b.wno = a.wno
AND b.mcd = a.mcd
AND TRIM (b.wno) = TRIM (vs_wno))
)
WHERE EXISTS (
SELECT 1
FROM a
WHERE b.wno = a.wno
AND b.mcd = a.mcd
AND TRIM (b.wno) = TRIM (vs_wno));