ORACLE SQL JOB SUPPORT - IDESTRAININGS

Oracle SQL Job Support means Stands for Structured Query Language, it is a collection of predefined commands, the commands are DML commands, DDL commands, DCL commands and TCL commands. In SQL is everything is predefined. The SQL is a special purpose language designed for managing data held in a RDBMS.

Why do we need Oracle SQL Database?

The data stored somewhere on the backend called the database, Database actually provides the permanent storage of the data. The data is actually stored in a tabular way and all the data is related to each other. The database table is not the only things which are stored as it may have the number of different types of object for the different purposes. Different objects have the different rules to perform like table and goal is to store the data, similarly it will be used to restrict the data and triggers it will be some validation or may be will take some implicit actions. The every each database objects have a different role to perform.

Classification of Oracle SQL Job Support:

We have five major classification of the SQL that is

Data Definition Language (DDL):

Any SQL command which is actually used to define some database objects like to create a table of view and index or anything, adding something new in the database. If any SQL command is affecting the structure or the information of database that will categorize in the data definition language.

Data Manipulation Language (DML):

Data manipulation language is once we have created the table in to insert some data, we insert some data it doesn’t affect this structure of database but it does affect the structure of the table.

Data Retrieval Language (DRL):

We have the data we can start retrieving that, that part will be deal with data retrieval language or data query language

Data Control Language (DCL):

The Data Control Language actually deals with the accessibility, if working centralized database and there are number of users who can access the same database will have specify the goal

Transaction Control Language (TCL):

Transaction control language is executing a number of SQL statements together then should take care of the transaction. this transaction control language will insure us like if it is getting successful both the commands or all the commands participating in a transaction will updating successfully.

PL/SQL Functions in Oracle Database:

We can identify a function as a self-contained sub-program that functions to do some specific well defined task. Functions are named PL/SQL block which means they can be stored into the database as a database object and can be reused. That is also the reason why some books refer to PL/SQL functions as stored functions. Actually in oracle PL/SQL there are two typrs of subroutines or say sub-programs, these functions are

1. PL/SQL Functions
2. PL/SQL Procedures

The concepts of functions and procedures are very closely related to each other. Where both have some similarities, they have some differences too. The syntax of PL/SQL function is divided into two parts. The first function is Header of the function and second is the Execution part of the function. The header consist of the signature of the PL/SQL Function and Execution part holds all the Execution statements as well as defines the working of your PL/SQL Function.

Advantages of using SQL Job Support:

• SQL is portable and the SQL is running in all servers, PCs, Laptops, mainframes, and even mobile phones.
• SQL queries can be used to retrieve large amount of records from a database quickly and efficiently
• SQL generally consists of English statements and as such, it is very easy to learn and understand, it does not required much coding in programming languages.
• SQL is used by all the vendors who develop DBMS. It is also used to create database, manage security for a database, etc. it can also be used for updating, retrieving and sharing data with users.