subschema การใช้

This subschema is standard-relational, with features such as constraints and referential integrity being used to the hilt.
The structure of the metadata is complex enough that it comprises its own subschema within the database : various foreign keys in the data tables refer to tables within this subschema.
The structure of the metadata is complex enough that it comprises its own subschema within the database : various foreign keys in the data tables refer to tables within this subschema.
In a clinical data repository, row modeling also finds numerous uses; the laboratory test subschema is typically modeled this way, because lab test results are typically numeric, or can be encoded numerically.
The modeling of the metadata subschema of an EAV system, in fact, is a very good fit for traditional modeling, because of the inter-relationships between the various components of the metadata.