What is RDBMS? full Explanation | Learn Coding | #rdbms

Summary

The video explains the concept of a Relational Database Management System (RDBMS) and how it organizes data in rows and columns. It defines key terms like entity, attribute, record, degree, cardinality, and domain with a practical example of a student table. The speaker demonstrates how to create a table, insert records, and retrieve data using Oracle 11g, with commands like `CREATE TABLE` and `INSERT INTO`. It offers a practical approach to understanding RDBMS and provides a link to a detailed SQL tutorial in the video description.

Takeaways

• 📚 RDBMS stands for Relational Database Management System, where data is organized in rows and columns.
• 🔢 In RDBMS, data is stored in a tabular format, with rows representing records and columns representing attributes.
• 📝 Key technical terms in RDBMS include Entity (Table), Attribute (Column), Record (Row), Degree (Number of Columns), Cardinality (Number of Rows), and Domain (Column Values).
• 🧑‍🎓 The example used is a 'Student Details' table with rows and columns illustrating how data is stored.
• 📊 The term 'Entity' refers to the table itself, and 'Attribute' refers to the columns within the table.
• 🎓 The degree of a table is the total number of columns, while cardinality is the total number of rows.
• 🔍 The 'Domain' refers to the possible values that a column can hold, like names in a 'Student' table.
• 💻 The practical demonstration included creating a table, defining its structure, and inserting records using SQL commands.
• 👨‍💻 The example SQL database used was Oracle 11g, but MySQL and PostgreSQL could also be used.
• 📺 For a detailed understanding of SQL and RDBMS, viewers are encouraged to check out the complete playlist linked in the video's description.

Q & A

What is RDBMS?

RDBMS stands for Relational Database Management System, and it organizes data in a tabular format with rows and columns.

How is data stored in an RDBMS?

Data is stored in a tabular form, meaning it is arranged in rows and columns within tables in the database.

What is an entity in RDBMS?

An entity in RDBMS refers to a table, such as 'Student Details' which holds data in a structured format.

What are attributes in an RDBMS table?

Attributes in an RDBMS table are the columns that define the data types and values, such as 'Name' or 'Age' in a 'Student Details' table.

What does 'record' mean in RDBMS terminology?

A record represents a single row in the table, containing all the corresponding data for a particular entry.

What is the 'degree' of a table?

The degree of a table refers to the total number of columns present in the table.

What does 'cardinality' mean in the context of RDBMS?

Cardinality represents the total number of rows in the table.

What is a 'domain' in RDBMS?

The domain refers to the possible values that an attribute (column) can have. For example, the domain of the 'Name' column might include 'Ankit', 'Ankush', and 'Akhil'.

What is a schema in RDBMS?

A schema is the structure that defines the organization of data in a table, including the columns, their data types, and relationships.

How do you insert data into an RDBMS table?

To insert data, SQL insert queries are used. The script demonstrates this by inserting three records into the 'Student' table.

What SQL command is used to view the structure of a table?

The 'DESC' (describe) command is used to view the structure of a table, showing all its columns and data types.