Technology Questions

Q:

In which namespace, all .NET collection classes are contained?

Answer

The System.Collections namespace contains all the collection classes.

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Subject: .NET

0 2221
Q:

What are the differences between mysql_fetch_array(), mysql_fetch_object(), mysql_fetch_row()?

Answer

mysql_fetch_array:
Fetch a result row as an associative array and a numeric array.

mysql_fetch_object:
Returns an object with properties that correspond to the fetched row and moves the internal data pointer ahead. Returns an object with properties that correspond to the fetched row, or FALSE if there are no more rows.

mysql_fetch_row():
Fetches one row of data from the result associated with the specified result identifier. The row is returned as an array. Each result column is stored in an array offset, starting at offset 0.

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Subject: PHP

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Q:

What are the differences between GET and POST methods in form submitting?

Answer

On the server side, the main difference between GET and POST is where the submitted is stored. The $_GET array stores data submitted by the GET method. The $_POST array stores data submitted by the POST method.

On the browser side, the difference is that data submitted by the GET method will be displayed in the browser’s address field. Data submitted by the POST method will not be displayed anywhere on the browser.

GET method is mostly used for submitting a small amount and less sensitive data.
POST method is mostly used for submitting a large amount or sensitive data.

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Subject: PHP

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Q:

What is DCLGEN?

Answer

DeCLarations GENerator : used to create the host language copy books for the table    definitions. Also creates the DECLARE table.

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Q:

How to recover a dropped table?

Answer

Dropped tables can be recovered using DROP TABLE flashback. It works the way recycle bin works.
Example:
FLASHBACK TABLE EMPLOYEE TO BEFORE DROP;
The most recently dropped table with that original name is retrieved from the recycle bin, with its original name.

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Subject: Oracle

0 2218
Q:

What is Wi-Fi technology and over which frequency band it operates?

Answer

Wi-Fi technology is a technology used for transmitting a signal using the 802.11 specifications works a lot like it does with a basic Ethernet hub: They’re both two-way forms of communication, and they both use the same frequency to both transmit and receive, often referred to a half-duplex. WLANs used radio frequencies (RFs) that are radiated into the air from an antenna that creates radio waves. These waves can be absorbed, refracted, or reflected by walls, water, and metal surfaces, resulting in low signal strength. So because of this vulnerability to surrounding environmental factors, it’s pretty apparent that wire-less will never offer us the same robustness as a wired network can, but that still doesn’t mean we’re not going to use or run the wireless or Wi-Fi.

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Q:

What role does Dalvik play in Android development ?

Answer

Dalvik serves as a virtual machine, and it is where every Android application runs. Through Dalvik, a device is able to execute multiple virtual machines efficiently through better memory management.

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Q:

What is the information does assembly manifest provide?

Answer

Information provided by Assembly Manifest:



  1.  Assembly Name

  2.  Version Number

  3.  Culture

  4.  Strong name

  5.  List of files inside the assembly

  6.  Reference information

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Subject: .NET

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