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Define null values. In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In the
what is correlation in nested query
Complete replication: It implies maintaining of a whole copy of the database at every site. Thus, the reliability & availability and performance for query response are maximized.
Lossless-Join Decomposition Let us show an intuitive decomposition of a relation. We require a better basis for deciding decompositions since intuition may not always be r
Data slice explanation
These are interactive interfaces, graphical that hide the difficulty of the DBMS and query language behind an intuitive, simple to understand, and convenient interface. This permit
random file orgnization
difference between internal schema and external schema in DBMS
comparison of oracle RDBMS with MySQL
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
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