很着急Oracle 语句错误 ORA-00933: SQL 命令未正确结束

[fenger0888]

select ua.*,ub.COMMENTS as comm from USER_TAB_COLUMNS as ua ,USER_COL_COMMENTS as ub where ua.table_name=ub.table_name and ub.table_name='BB_BB'

到底是哪里错了啊！
谢谢！

[小海葵1]

USER_TAB_COLUMNS as ua USER_COL_COMMENTS as ub AS去了。

[fenger0888]

谢谢，太厉害了。困扰了我一天。就是没写出来。