# Package adql.db.exception

- Exception Summary
  Exception | Description
  --- | ---
  UnresolvedColumnException | This exception is thrown by `DBChecker` when a column does not exist or whose the table reference is ambiguous.
  UnresolvedFunctionException | Exception thrown when a function can not be resolved by the library.
  UnresolvedIdentifiersException | This exception is thrown by `DBChecker` when several columns or tables do not exist.
  UnresolvedJoinException | This exception is thrown when a table between 2 tables can not be resolved, and particularly because of the join condition (i.e.
  UnresolvedTableException | This exception is thrown by `DBChecker` when a table does not exist or whose the schema reference is ambiguous.