SQL - Schema (Metadata)

Data System Architecture


A SQL schema is two things:

A SQL Schema is:

Scope / Level

Most providers have a limited number of levels; for example, most databases have either;

  • one level (“schemas”)
  • or two levels (“database” and catalog.

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(Relation|Table) - Tabular data

A Relation is a logical data structure composed of tuple (row) attribute (column, field) The following data structure are a relation: a table, a materialized view (query) (store data) a query,...
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Cassandra is a NoSql database for transactional workloads that require high scale and maximum availability. Cassandra is suited for transactional workloads at high volume and shouldn’t be considered...
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A schema is a logical collection of schema objects all of which are owned by a user.
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A column is the relational model representation of a value set where the attribute is the column metadata that defines its name, type and others attributes properties The columns are located in the Y...
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CREATE is a SQL statement that defines the SQL object and therefore the schema
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SQL - Catalog

A catalog is a named collection of: SQL-schemas, foreign server descriptors, and foreign data wrapper descriptors
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A stored procedure is a compiled SQL program, consisting of one or more SQL statements, which resides and runs on the target database. A Stored Procedure transformation is an important tool for populating...
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A view is a stored query A view is stored as an algebraic closure so it can be optimized when used with queries. That is just not true. A view is nothing more than a stored query. If the stored query...
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SQLite - Metadata (Schema)

SQLite is different from most of the database in that it stores the schema (metadata) in the sqlite_schema table as the original text of the CREATE statements that define the schema.

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