create table, Database Management System

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What are the advantages of creating a table from existing table?

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To delete a particular column in a relation which command is used ? To delete a particular column in a relation ALTER command is used.

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What are domain constraints?  A  domain is  a  set  of  values  that  might  be  assigned to an attribute  .all  values that appear in a  column of a relation must be taken fro

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Explain data dictonary on oracle ? Data Dictionary - Data dictionaries are the system tables in which contain descriptions of the database objects and how they are structured.

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