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Database Programming

Databases are collections of tables that maintain and display information, often collaboratively; this information can be used for interaction with an application or gaining general knowledge. Questions about database engines and modifying or using them belong in this category.

8,803 Questions

What are the importance of table form query in database?

In database system the data is stored in the form of table. So to store the data in the database, table are very important in a database system.

What is the term for a database that contains multiple tables of information that can be joined through common fields?

The term for a database that contains multiple tables of information that can be joined through common fields is a relational database. In relational databases, data is structured into tables, each with rows (records) and columns (fields), and relationships between tables are established through keys.

How is relational model better than traditional file processing?

The relational model offers better data organization through its structured tables with defined relationships between them, facilitating data consistency and integrity. It also allows for more efficient querying and retrieval of data using SQL, compared to the sequential file access in traditional file processing systems. Additionally, the relational model supports normalization to reduce data redundancy and improve data maintenance.

How do you insert a row into a table?

Row can be inserted in to a database using DML (data manipulation language). Example :- insert into table_name [<colum_list>] values (<value 1>, <value 2>, ...);

Which is an untrue statement about unclassified data?

An untrue statement about unclassified data could be that it does not require any protection or security measures. All data, regardless of classification, should be protected according to its sensitivity level to prevent unauthorized access, modification, or disclosure.

Have all tables primary key?

No, all tables do not have primary key. Primary must be explicitly defined and must not be null.

What a good database design require?

A good database design requires that the Data is conveniently and efficiently stored. Also the data can be easily stored and maintained.

What is a transaction in a data base system?

Like transaction in banks there are transactions in a database system too like deleting data is also a transaction. Transaction can be recovered using rollback and save point.

How E R diagram attributes are represented?

ER diagram stands for Entity relation diagram. There are two main components in a ER diagram one is the entity like (students) and their attributes like (name , rollno) and the relationship between different entitites.

What key trade offs and etical issues are association with safeguarding of data and information system?

Key trade-offs associated with safeguarding data and information systems include the balance between security and accessibility, the trade-off between level of protection and cost, and the trade-off between convenience and security. Ethical issues may include privacy concerns, data ownership and control, and the potential for data breaches and misuse. Organizations must carefully navigate these trade-offs and ethical considerations to establish effective safeguards for their data and information systems.

How data loses its integrity?

In database system one of the main feature is that it maintains data integrity. When integrity constraints are not enforces then the data loses its integrity.

What is tapping data?

You must have heard about tapping of phone . Tapping data is same as tapping a phone , all the data entered into the database will be visible during tapping.

What is multi-user of databases?

There are several types of databases- such as "relational" (Oracle for example). Multi-user database is a database that contains (normally) several "tables" where each table has rows and columns, and where these rows and columns intersect is a "data element". Multi user databases support several concurrent users (simultaneous) for reading or writing data to the tables in the database. For example, a list of addresses, phone numbers and names for a city could be a table. With other tables having other demographic data. Several users could "search" for a variety of combinations of this data, while another group of users could be adding more "records" (data elements).

How is database structured?

That depends on the type of database it is and the design of the Database Annalist.

What is a database that contains facts provided by a human expert and rules that the expert system should use to make decisions based on those facts?

A knowledge base is a database that contains facts provided by a human expert and rules that an expert system uses to make decisions based on those facts. The knowledge base helps the system replicate the decision-making process of the human expert.

What is data integrity errors?

There are a number of ways that data can cause errors in the database plateform. Human error - keying in data incorrectly such as text in a number field,

  • Errors that occur when data is up - down loaded between computers or programmes
  • Software structure becomes contaminated or fails
  • Hardware malfunctions such as saves which fail due to disks breaking down

What does it mean to filter sort and update records?

To filter is to apply some criteria so only some records are shown. For example, from a list of people you may apply a filter so that it lists only the males.

To sort means to list them in order, such as alphabetical order, or date order or numerical order. This is often done with records to make it easier to find things. Phone books are in sorted by name to make it easier to find the number you want.

To update means to change records by adjusting the data in some way. You might be entering the results of exams that students have taken, or giving everyone an increase in their wages for example. These are all updates.

What is trouble code P0010 on 2001 Audi A4?

P0010 - "A" Camshaft Position Actuator Circuit (Bank 1)
Car will run rough

Could be
Faulty oil control valve (OCV)
Open or short in the VVT/VCT circuit
Open or short in the OCV / solenoid valve
Damaged computer (PCM)

Check
Check the Bank 1 VVT/VCT system circuit wiring and connectors, repair if needed
Warm up the engine, test the operation of the OCV, replace or repair if necessary

What is an intelligent database?

An intelligent database is a type of database that incorporates artificial intelligence and machine learning technologies to automate tasks, make predictions, and optimize performance. It can automatically analyze and interpret data in real-time to uncover patterns, trends, and insights that can help users in decision-making processes.

Why it is important to organize information in a database?

If it is not organised, a database is useless. A database is a file of organised and structured data. If you take a phone book, although there are thousands of names in it, you can very quickly find the number that you are looking for. That is because it is organised, with names in columns, addresses in columns and numbers in columns, and the entire phone book has the entries entered in alphabetical order. If you had another phone book, with all the same names, address and phone numbers, but they were not organised, it could take you hours to find the number you were looking for. So if data is organised in a database, then it is much easier to work with it, not just for finding data, but also for doing many other things with it. A badly designed database will result in lots of problems when you try to use it. So it is very important to properly design a database so that all of the data is organised in it.