Download Database System Concepts and Architecture

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Transcript
Schemas
• Is the description of the database (not database itself)
– Specified during database design
– Not expected to change frequently
– A displayed schema is called a schema diagram (Fig 2.1)
• Each object in the schema-such as STUDENT or
COURSE-is a schema construct.
• Schema diagram represents only some aspects of a
schema (name of record type, data element and
some type of constraint)
Jan 29, 2002