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What is E-R model?
This data model is based on real world that having of basic objects called entities and of relationship between these objects. Entities are explained in a database by a set of attributes.
What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is
#question.explain diversity and magnitude of organic compounds and general properties?
#question.what is mapping constraints and types?.
What are the benefits of document scanning? Document scanning, in addition to being cost-efficient, also enhances productivity. This service enhances security as you set the pa
Example :; transfers transfer_amount from x's account to y's account ; Supposes x&y both accounts exist TRANSACTION (x, y, transfer_amount) Start transaction IF X AND Y
Describe entity referential integrity and integrity. Give an example of each. Entity Integrity Rule - If there is a attribute A of relation R is a prime attribute of R then A
what characterizes the levels in RAID technology
The functions of DBA ?
A field-groups statement or an insert statement reverses storage space and transfers values. False.
Give the general form of SQL query? Select A1, A2............., An From R1, R2..............., Rm Where P
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