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Posted Date :
July 26, 2011
It is a object that manipulate data in a set row by row.
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Database: Define Stored Procedure
.A stored proceduer is a named group of sql statements that have been previously created and stored in server database.
Database: Define trigger?
It is a Stored procedure that initiates an action when an event occurs. Event can be insert, delete or update.
Database:List step to be performed to work with
Declare cursor,Open cursor,Fetch row from cursor,process fetched row,close cursor, deallocate cursor
Database: Define collation?
Collation is a set of rules that defines how the data is to be sorted and compared.
Database: Define sub query
A sub-query is also refereed as sub-select, they are enclosed with in the body of another sql statement, Sub select statement generally return single row i.e atomic value and then compared with multiple rows using IN keyword in sql statement that encompases sub-select statement.
Database: Define primary key and foreign key?
Primary key is use to uniquely identify each row they are unique and cannot be null where as foreign key are use to ensure data integrity and relationship between tables.
Database: Define Identity Column?
Identity column is a column that automatically generates numeric values. Start and increment value are the two properties of prior importance that need to be set with respect to Identity column. Value of this column is mostly used to identify each row uniquely
Database:Define SQL server agent
Its main aim is to ease the implementation of task for the dba with scheduleing of the jobs and scripts.
Database Concurrency in Sql Server.
When two or more user try to update same type of data in a table then Database Concurrency helps in this situation.
There are 2 types of Database Concurrency
Pessimistic: When one user try to change the data with pessimistic concurrency then a lock is placed on the data in a table so that another user cannot change data. when one user finishes then other user can able to change.
Optimistic: When two user works on the same data in a table and one change that data first then second user cannot change that same data becasue the which he have using is allready changed so he cannot do the change becasue change apply to another data that is changed by first user.
Which is the subset of SQL commands used to manipulate Oracle Database structures, including tables?
Data Definition Language (DDL)
Define namespace in C++ ?
It is a feature in c++ to minimize name collisions in the global name space. This namespace keyword assigns a distinct name to a library that allows other libraries to use the same identifier names without creating any name collisions. Furthermore, the compiler uses the namespace signature for differentiating the definitions.
Define precondition and post-condition to a member function.
A precondition is a condition that must be true on entry to a member function. A class is used correctly if preconditions are never false. An operation is not responsible for doing anything sensible if its precondition fails to hold.
For example, the interface invariants of stack class say nothing about pushing yet another element on a stack that is already full. We say that isful() is a precondition of the push operation.
A post-condition is a condition that must be true on exit from a member function if the precondition was valid on entry to that function. A class is implemented correctly if post-conditions are never false.
For example, after pushing an element on the stack, we know that isempty() must necessarily hold. This is a post-condition of the push operation.
What is a Database system?
The database and DBMS software together is called as Database system.
Define the "integrity rules"
There are two Integrity rules.
1.Entity Integrity: States that "Primary key cannot have NULL value"
2.Referential Integrity: States that "Foreign Key can be either a NULL value or should be Primary Key value of other relation.
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