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What is vertical fragmentation?
Vertical fragmentation divides the relation by decomposing the scheme R of relation r.
Define single valued and multivalued attributes. Single valued attributes: attributes with a single value for a particular entity are known as single valued attributes. Mult
WHAT IS MEANT BY E-R MODEL
Query Processor The query language processor is responsible for taking query language statements or shifting them from the English-like syntax of the query language to a form
Explain Hierarchical Model ? Hierarchical Model - It was established to model several kinds of hierarchical organizations which exist in the real world. It uses tree structur
Differentiate between a subquery and a join If we need to acquire information from one or more tables after that either subquery or join can be used. If the columns which are t
The primary key is selected from the
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
Explain P command in the respect of QBE? P: It is the command in which is used to print (logically display) the value of the attribute in whose cell it is writ
Key to represent relationship amongs tables is called ? A Key that represent the relationship between tables is called Foreign Key.
What are called journaling file systems? File systems that support log disks are known as journaling file systems.
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