| Parameters: | 
spec : dict, optionalDictionary mapping strname toTableSpec, as returned bySchemaConfig.toSpec.  Will be constructed from default configuration
if not provided. | 
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| Attributes: | 
metadata : sqlalchemy.MetaDataThe sqlalchemy schema description.tables : dictA mapping from table or view name to the associated SQLAlchemy object.
Note that this contains both true tables and views.views : setThe names of entries in tablesthat are actually implemented as
views. | 
|---|