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Define data model?
A data model is a collection of conceptual tools for explaining data, data relationships, data semantics and consistency constraints.
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
Example : Create a sequence named SEQSS that starts at 105, has a step of 1 and can take maximum value as 2000. CREATE SEQUENCE SEQSS START WITH 105 INCREMENT BY 1 MAX VA
what is union compatable?
Give the two reasons for allowing concurrency
#questiononsider the following relation: CAR_SALE =(CAR_ID,oPTION_TYPE, Option_listpreice, Sale_date, Option_discountedprice)..
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
Package classes and associations into models Programs are made of separate physical units which could be edited, imported, complied or otherwise manipulated. The careful part
Define blocks? The database system resides eternally on non-volatile storage, and is into fixed-length storage units known as blocks.
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
Let us first look into some of the important features of ER model. Entity relationship model is a high-level conceptual data model. It permits us to define the data invo
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