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What is relational database management system(RDBMS)?
Relational Database Management System:
A RDBMS is a database management system (DBMS) that is based on the relational model given by E. F. Codd(a research fellow working for IBM). In other words, we define relational database management system (RDBMS) is a collection of programs that lets you create, update, and administer a relational database. The most commercial RDBMS's use the Structured Query Language (SQL) to access the database.
The most popular DBMS products in the current market are Oracle, IBM's DB2, Microsoft's SQL Server, MySQL and Sybase.
What is structured query languages?
Structured Query Languages(SQL):
Structured Query Language (SQL) is a widely-used query language for using database. SQL has been the favorite query language for database management systems running on minicomputers and mainframes computers. The SQL forms are the backbone of most modern relational database systems. The important feature of the SQL is an interactive approach for getting information from and updating a database.
In technical terms, SQL is a combination of two languages namely Data Definition Language (DDL) and the Data Manipulation Language (DML). SQL Database supports different types of operations.
There are various types of SQL statements as follows:
- Data Definition Language
- Data Manipulation Language
- Transaction Control Language
- Session Control Language
- System Control Language
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Today Oracle is a most powerful relational database management system(RDBMS) that offers a large feature. Along with Oracle, Microsoft SQL Server is widely used as one of the two most popular full-featured relational database systems in the market.
Here we define various Keys of Oracle Database for students reference.What is Keys?
Key is used in the definitions of several types of integrity constraints. A key is the column or set of columns included in the definition of certain types of integrity constraints. Keys describe the relationships between the different tables and columns of a relational database.There are different types of keys in Oracle database as follows:
- Primary key: The column or set of columns included in the definition of a table's PRIMARY KEY constraint. A primary key's values uniquely identify the rows in a table. Only one primary key can be defined for each table.
- Unique key: The column or set of columns included in the definition of a UNIQUE constraint.
- Foreign key: The column or set of columns included in the definition of a referential integrity constraint.
- Referenced key: The unique key or primary key of the same or a different table referenced by a foreign key.
A FOREIGN KEY in one table points to a PRIMARY KEY in another table.
Examples for specifying a primary key when creating a table (using CREATE TABLE) or by changing the existing table structure (using ALTER TABLE).
|Foreign Key||Create table Book (
BookId integer PRIMARY KEY,
|Create table Book (
Primary Key (BookId),
Foreign Key (Student_Sid) references Student(Sid));
Create table Book (
|Specifying a primary key by Altering a table||ALTER table Book ADD FOREIGN KEY (Student_Sid) references Student(Sid);>||ALTER table Book ADD FOREIGN KEY (Student_Sid) references Student(Sid);||ALTER table Book ADD(CONSTRANT fk_Student_Sid FOREIGN KEY(Student_Sid) REFERENCES Student(Sid));|
|DROP TABLE||Drop TABLE Book;||Drop TABLE Book;||drop table Book cascade constraints;
Note: if foreign key are available in that table
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