Technology Questions

DHTML stands for Dynamic HTML. The first thing that we need to clear about DHTML is that it is neither a language like HTML, JavaScript etc. nor a web standard. It is just a combination of HTML, JavaScript and CSS. It just uses these languages features to build dynamic web pages. DHTML is a feature of Netscape Communicator 4.0, and Microsoft Internet Explorer 4.0 and 5.0 and is entirely a "client-side" technology.  

Features of DHTML:

- Simplest feature is making the page dynamic.

- Can be used to create animations, games, applications, provide new ways of navigating through web sites.

- DHTML use low-bandwidth effect which enhance web page functionality.

- Dynamic building of web pages is simple as no plug-in is required.

- Facilitates the usage of events, methods and properties and code reuse. 

Both the statements are true 

JavaScript is an interpreted language, not a compiled language. A program such as C++ or Java needs to be compiled before it is run.

The source code is passed through a program called a compiler, which translates it into bytecode that the machine understands and can execute.

In the call by reference, it will just copy the address of the variable to access it, so it will reduce the memory in accessing it.

A subquery in an SQL SELECT statement is enclosed in parenthesis (...).

The a_struct is declared as structure name and its data element is a.

RDBMS is a database management system based on relational model defined by E.F.Codd. Data is stored in the form of rows and columns. The relations among tables are also stored in the form of the table.

Features:
- Provides data to be stored in tables
- Persists data in the form of rows and columns
- Provides facility primary key, to uniquely identify the rows
- Creates indexes for quicker data retrieval
- Provides a virtual table creation in which sensitive data can be stored and simplified query can be applied.(views)
- Sharing a common column in two or more tables(primary key and foreign key)
- Provides multi user accessibility that can be controlled by individual users