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In a Hierarchical model of data records are organized ? In the hierarchical model of data records are organized as Tree structure.
The State of NewYork certifies firefighters throughout state and keep track all of them, as well as of the state’s fire departments. Each fire department has unique department numb
What function divides one numeric expression by another and returns the remainder? MOD function divides one numeric expression by another and returns the remainder.
why are older data base model are being replaced by new data model
What is Interaction Diagram An interaction diagram shows an interaction, comprises of a set of objects and their relationships including the messages that may be dispatched be
Find the names of all Albums that have more than 30 tracks. Result: (name: varchar(255))
What is NULL? Simply NULL means not in value.
Types of Locks There are two necessary types of locks: Binary lock : This locking mechanism has two states for to a data item: locked or unlocked Multiple-mode loc
What are the disadvantages of relational data ? Disadvantages • Performance - If the number of tables among that relationships to be established are large and the tables t
Table Handling In RDBMS more than one table can be tackled at a time by using join operation. Join operation is a relational operation that causes 2 tables with a common domai
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