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What do you mean by persistence? How you will make your data persistent?
Persistent data is the data, which has a longer lifetime than program which has created it. Enabling the data to be stored on the permanent storage medium provides persistency. The most frequent techniques used to store data is in form of files or to make use of a back-end database system.
Where does view definition stored? A view definition is permanently stored as part of the database.
What is DML compiler? DML Compiler: Translates DML statements in a query language within low level instructions understandable through the query evaluation engine. Attempts to
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Create an index for the table Client, field CLIENT_NO of Q ? Command: CREATE INDEX client_client_no ON client(client_no);
What are the three classes of SQL expression? SQL expression consists of three clauses: Select From Where
Suppose R is a relation with attributes A1, A2,..., An. As a function of n, tell how many superkeys R has, if: 1.1 The only key is A1. 1.2 The only key is A1 and A2. 1.3 The o
A database to track your progress in your college program will track your progress towards graduation! A database that has information containing the classes that you have taken, c
The External or View Level The external or view level is the highest level of abstraction of database. It gives a window on the conceptual view, which permits the user to see
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
Explain the concept of generalization and aggregation in E_R diagrams. Give one example for each one of them? Generalization: Consider extending the entity set account throug
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