Download Database System Concepts and Architecture

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Transcript
DBMS Languages …..
• SQL relational database language: represents a
combination of DDL, VDL, and DML, as well as
statements for constraint specification and schema
evolution
• There are two main types of DMLs:
– A high-level or nonprocedural DML : specify complex DB
operations. Example SQL(set-at-a-time)
– A low-level or procedural DML: retrieve individual records
or objects from DB and process each separately (record-at-atime).
Jan 29, 2002