Data dictionary views about tables and columns
Mapping of characteristics:
| TABLE_NAME | Contains the name of the table |
| AVG_ROW_LENGTH | A column in the USER_TABLES view |
| DATA_TYPE | A column in the USER_TAB_COLUMNS view |
| ALL_TABLES | Lists the tables in all the schemas the current user has access to |
| COLUMN_NAME | Contains the name of the columns in the USER_TAB_COLUMNS view |
| USER_TABLES | Lists the tables in the current user's schema |
