employees and projects scenario, Database Management System

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What count function return in sql, What Count function return in SQL? C...

What Count function return in SQL? Count function within SQL returns the number of values. (Count function counts all the not null values in the exact column. If we need to cou

Data model in DBMS, how many types of data model in DBMS? explain data abst...

how many types of data model in DBMS? explain data abstraction with its different level

Availability-data replication, Availability: A site having the copy of a r...

Availability: A site having the copy of a replicated relation fails, even then the relation may be found in another site. Therefore, the system may carry on to process at least th

Deletion operation - update operations, By using the delete operation some ...

By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which

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Explain the use of constraints in functional model with suitable example. A constraint shows relationship between two objects at same time, or   among various values of the sam

Relationship between security and integrity, Relationship between Security ...

Relationship between Security and Integrity: Database security usually refers to access, while database integrity refers to avoidance of accidental loss of consistency. But usually

1) Information about a bank is about customer, 1) Information a...

1) Information about a bank is about customers and their account. Customer has a name, address which consists of house number, area and city, and one or more phone numbers. Ac

Explain the uses of deadlock, Explain the uses of deadlock It will lea...

Explain the uses of deadlock It will lead to deadlock since this is the only place where incoming acknowledgements are processed. Without this code, sender will keep timing ou

Define weak and strong entity sets, Define weak and strong entity sets?  ...

Define weak and strong entity sets?  Weak entity  set:  entity  set  that  do not  have  key  attribute  of  their  own are  known as weak entity sets.  Strong entity set

Consistency, what do you mean by consistency in rdbms?

what do you mean by consistency in rdbms?

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