SQL - Schema (Metadata)

1 - About

A SQL schema is two things:

A SQL Schema is:

  • created via the SQL CREATE statement.
  • altered via the SQL ALTER statement

3 - Id

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

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

4 - Information Schema

Information_schema is an ANSI-standard set of read-only views which provide information about

5 - Example

The schema of a relation is its columns along with all attributes such as data type.

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