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What is a primary key?
Primary key is chosen by the database designer as the principal means of identifying an entity in the entity set.
From SAD to OOAD (Structured Analysis and Design (SAD) to Object Oriented Analysis and Design (OOAD). We will find here how we can map various models in SAD to different model
give some example real life situation where DBMS are most suitable
what is definition hierarchical data model
While sorting, if the main storage available is not enough, the system writes data to an external help file. The SAP profile parameter, which determines DIR_SORTTMP
what is the need of a log in dbms
Explain three main attributes of data.
Define what Immediate database modification technique uses? Ans: Both undo and redo.
What are the three types of data sources used with ODBC? An ODBC file data source is a file that can be shared between database users. An ODBC system data source is one that is
For problems 1-4, give all candidate keys for the tables with FDs specified. Composite candidate keys must be put in parentheses, and candidate keys must be separated with commas
SELECT Statement This statement is used for retrieving information from the databases. It can be coupled with many clauses. Let us talk about these clauses in more detail:
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