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Define Partial Key and Primary Key
A partial key, also known as discriminator, is the set of attributes which can uniquely identify weak entities that are related to similar owner entity. Primary key is a unique key but not comprise null values. An entity set can comprise at most one primary key.
What is a value? A data value is used for identity. This form of identity is used in relational systems.eg: The primary key value of a tuple recognize the tuple.
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
sql is relationally complete-justify
what is the importance of back up files
What does the cardinality ratio specify? Mapping cardinalities or cardinality ratios state the number of entities to which another entity can be associated. Mapping cardinaliti
Write short notes on extension and intension? In any data model, it is significant to distinguish among the description of the database and the database itself the description
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
What are the two types of errors? The two types of errors are: a) Logical error b) System error
What is DML Query Langauge? Data Manipulation Language (DML) - A data manipulation language is a language in which enables users to access or manipulate data as organized throu
notes about update opreation
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