0
1. Database may need completely redoing if a single field in one relational table has to be changed.
2. If an ERD is resolved incorrectly then it would have to be redone.
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
What was the preferred method of muslim scientist?
logical reasoning
Advantages and disadvantages of data manipulation language in sql?
advantages of data manipulation language:1.the DML statements can modify the data stored in a database.2.user can specify what data is needed.3.dml tends to have many different flavours and capabilities between database vendors.4.it provides efficient human interaction with the system.disadvantages of data manipulation language:1.dml cannot be used to change the database structure.2.tables or columns cannot be created or deleted using dml.
What are advantages and disadvantages of circular queue over ordinary queue?
Circular queues are very efficient and work well with low level codes. Ordinary queues are the standard type of queue but they do not maximize memory data well.
Is there anything larger than infinity?
Infinity is the most logical way to say forever.
What are the disadvantages of national integration?
Regionalismcommunilismreligious fanatsicmterroresmregional aspirations
What are the advantages and disadvantages of the Logical Data Modeling Methodology?
ahsan is the best.
What is high level data modelling?
Hi, High level Data modelling is the process of define and analyze the data requirement.
What are the disadvantages of computer modelling?
computer are not exact. It is approx
Which phase of the data modelling process contains security review?
Data Sources
Data modeling in system analysis and design?
data modelling is used for organising and structuring of data. we can get overview through generic modelling. organising of data means representing the data in such a way that it comes in a particular order via graphical representation.
Logical organization of data?
logical organization
How can table data be arranged into a logical order?
Table data can be SORTED to arrange it in a logical order.
What can be typed and entered into a cell?
Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.Any kind of data, including text, numbers, dates, times and logical data can be entered into a cell.
What are the advantages and disadvantages of Entity Relationship Diagrams?
Entity-Relationship diagrams are useful for modelling data and the relationships between the data. They can be used when the constraints between data are relatively simple. They do not allow specification of interactions between the data or model how the data changes (there are no processes in Entity-Relationship). Entity-Relationship diagrams are most often used to model databases.
Why logical data independence is more difficult than physical data independence?
Logical data independence is considered more difficult than physical data independence because it involves changes to the conceptual schema and external schema, which are more closely tied to the way data is organized and viewed in the application. Physical data independence, on the other hand, deals with changes to the internal schema, which is more abstract and can be modified with less impact on the overall system.
What are the advantages and disadvantages of primary and logical partition?
Primary partition:you can install additional Operating system (eg:- windows 8, linux etc.)Logical Partition:Just additional drive which can be used to store additional data/ normal files/ software.
What separates the physical aspect of data storage from the logical aspects of data representation?
A schema separates the physical aspect of data storagefrom the logical aspects of data representation.
