https://blog.csdn.net/u013303551/article/details/52354230
SELECT t.table_name、
t.colUMN_NAME、
t.DATA_TYPE || '(' || t.DATA_LENGTH || '')、
t1.COMMENTS
User_Tab_Colsさt、User_Col_Comments FROM T1
WHERE t.table_name = t1.table_name
AND t.column_name = t1.column_name。