Schema, Database Management System

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difference between internal schema and external schema in DBMS

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What is null, What is NULL? Simply NULL means not in value.

What is NULL? Simply NULL means not in value.

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Describe Interfaces for the DBA? Interfaces for the DBA - Most database systems holds privileged commands which could be used only through the DBA's staff. These involves com

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What does the extract statement do in extract datasets? The data is written to virtual memory by extract commands.

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Define null value, Define NULL value NULL value NULL means something is...

Define NULL value NULL value NULL means something is unknown. It does NOT mean null (the digit 0). Null is as well employed as attribute value for a particular entity in which

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Entity types that do not have any key attribute, and therefore cannot be identified independently, are known as weak entity types. A weak entity can be recognized uniquely only by

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