Technology Questions

Java uses sand box security model.

Pseudo elements allow the use of the part of element and not the element itself. They are applied to block level element, which is used for the complete block for which the CSS is being written. This allow the subpart of an element to be styled like paragraphs and headings. For example:

selector:pseudo-element {property:value;}

p: first-line {text-transform: lowercase;}

It adds the style to the first line of the code in the paragraph.

Android uses Dalvik Virtual Machine (DVM) which requires a special bytecode. We need to convert Java class files into Dalvik Executable files using an Android tool called "dx". In normal circumstances, developers will not be using this tool directly and build tools will care for the generation of DVM compatible files.

Basically website is an information provider, It provides information globally using internet protocols.

-To store information usually relevant to browsers and search engines.

-To only store information usually relevant to browsers

-To only store information about search engines.

-To store information about external links

FIND_GROUP(function) FIND_COLUMN(function)

Cursors help you manipulate the information retrieved by select statements. This can be done by assigning a name to the cursor.

Example:

CURSOR emp_cur 

IS 

SELECT emp_number from employee_tbl where employee_name = name_in;

Types of Cursors:

Implicit cursors- These cursors are not declared by the programmer. They are issued when the SQL statement is executed. The open, close and fetching is done by itself.

Example:

UPDATE employee SET salary = salary * 2.1;

Here, an implicit cursor is issued to identify the set of rows in the table which would be affected by the update.

Explicit cursors- These cursors are defined by programmer. They are used in queries that return multiple rows.

Example:

CURSOR emp_cur 

IS 

SELECT emp_number from employee_tbl where employee_name = name_in;

The JVM performs three main tasks:

• Loads code

• Verifies code

• Executes code