To appear for the SQL online test, you need to have the details on the concept. It is best that you start with the definition and the details of SQL. It is the acronym in case of the structured Query Language. It is also denoted as the purpose based computer programming language. The same is designed for the reason of data management as part of the Relational Database Management System precisely known as RDBMS. However, the SQL programming language was authentically developed on the basis of the tuple relational calculus and also on the basis of the relational algebra. The language includes the major components like
- Data manipulation language
- Data definition language
- Data control language
Evolvement of SQL over the Time
There are specific areas where the SQL language can be used with the best of success. It comes with the features of online coding platform. The language is used in matters of data insertion, query, update, data access, delete, control, along with creation and modification of the schema. It is evident that SQL language is aptly regarded as the declarative language and in the process it consists of the certain procedural elements at the best. This is how the language evolved over the time with the set of specifications and specialties.
The development of the SQL language started with the efforts of Raymond F. Boyce and the initiative of Donald D. Chamberlin. However, the initial development of SQL started at IBM in the beginning part of the year 1970. The early part of the language is known as SEQUEL and things were developed for the reason of manipulating and the retrieval of data that was being stored on the system R, and this was considered to be quasi relational and the perfect database management system as part of IBM.
You ought to consider the fact that SQL works out to be an exclusively programming language. This interfaces with the database. It would boil down to the fact of analysing database including data as part of their tables. This works beneficial for an organization where you need to store and manage a lot of data. With a database you go on to interact with a database. Any updates on a database are undertaken and at the same time even retrieval of data can be done by SQL.
The system was being developed with the efforts of the group of the individuals based at San Jose Research Laboratory of the IBM during the time of the 1970s. However, after a decade the name of the version was changed from SEQUEL to SQL. The Relational Software Inc. now known as the Oracle Corporation did understand the real abilities of the concept as offered by Boyce and Codd and also Chamberlin. In consequence, the Company started working on the development on the personal RDBMS and things are perfectly based on SQL. It was the aim of the company to sell the system to the source of the Central Intelligence Agency, the US Navy, and the other major agencies of the USA government.
The first implementation of SQL was commercially available and it was released by the Relational Software Inc. in the month of June of 1979. It was given the name of the Oracle version 2 and things were operated on the VAX computers. IBM conducted the various tests based on the SQL structure at the customer sites and this helped in the identification of the degree of the practicability and the usefulness of the system. In the process, the company started to develop products like SQLDS, DB2, and the System38 for various commercial reasons. Most of these products are based on the prototype of the R system.
SQL is known to be the standard language used for the reason of communication with the relational database management systems and this includes the Oracle, the Microsoft SQL Server, Informix, Sybase, and also the Microsoft Access. With the option of SQL in hand you have the ability to build the database by entering into the same, manipulating the data and the query as part of the database data that is usually used in taking business and personal decisions.
SQL is the simplest form of English like language and you can learn the same with the best of ease. The language is used and it is learnt by the level of the perfect database user. SQL is the vast and the fast growing technological field used in various businesses all over the world. It is perfect to accept the SQL knowledge in relation to the database and the concerned management system. Before everything it is important to go through the background of SQL and deal with some of the preliminary areas that you should know from the depth.
To sit for the SQL Online test you must have an in-depth understanding of the subject. It is time that you know about ANSI SQL. ANSI stands for American National Standards Institute and this is the organization to approve certain standards in various industries. SQL is deemed as the standard form of language in relation to database communication and originally it was approved in the year 1968 based on the implementation theory of IBM. In the year 1987, the ANSI SQL standard was being accepted and it was considered to be the international standard by the International Standards Organization or ISO.
The standard was once again revised in the year 1992 and this came to be known as SQL-92. However, the newest version of SQL is known with the identity of SQL-99 and some even refer the same as SQL3. The version of SQL-99 comes with the latest five interrelated documents and also the rest of the data that would be added in the near future. There is the new and the perfect ANSI standard and this consists of both levels of the minimal compliance that may be claimed by DBMS. This includes the core SQL support and the enhanced SQL support.