ACC 340 Week 5, Chapter14 DQ 14-3

May 8th, 2015
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ACC 340 Week 5, Chapter14 DQ 14-3

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Chapter 14 Discussion Question 14-3What are the data definitions languages (DDLs)? How are they related to DBMSs?A Data Definition Language or Data Description Language (DDL) is a computer language for defining data structures. The term DDL was first introduced in relation to the Codasyl database model, where the schema of the database was written in a Data Description Language describing the records, fields, and "sets" making up the user Data Model. Later it was used to refer to a subset of SQL, but is now used in a generic sense to refer to any formal language for describing data or inf

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