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When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
In case of entity integrity, the primary key may be declared? In a case of entity integrity primary key may be not Null.
Consider the E/R schema with weak entity sets shown below. Come up with the SQL CREATE TABLE statements (with appropriate primary key, unique and foreign key constraints). Include
What is the use of sub queries? A sub query is a select-from-where expression that is nested with in another query. A common use of sub queries is to do tests for set membershi
Differentiate between a unique key and a primary key. - By default, clustered index on column are created by primary key while nonclustered index are created by unique key.
lock and types of lock
Single Valued Normalisation Codd in the year 1972 formed three normal forms (1NF, 2NF, and 3NF). These were based on functional dependencies between the attributes of a relati
Creating views with Read only option : In the view definition this option is used to make sure that no DML operations can be done on the view.
differences between a classified catalog and a dictionary catalog
What is meant by mean time to failure? The mean time to failure is the amount of time that the system could run continuously without failure.
using the invoice table shown below,write the relational schema,draw a dependencies,inclunding all partial and transitive dependencies.assume that the table does not contain repeat
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