What is RDBMS?

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Answer:

RDBMS: It is referred as Relation Database Management Systems (RDBMS).

RDBMS possesses a set of the below given characteristics:

Write-intensive operations: The RDBMS is frequently written to and is often used in transaction-oriented applications.
Data in flux or historical data: The RDBMS is designed to handle frequently changing data. Alternatively, RDBMS can also store vast amounts of historical data, which can later be analyzed or "mined".
Application-specific schema: The RDBMS is configured on a per-application basis and a unique schema exists to support each application.
Complex data models. The relational nature of the RDBMS makes it suitable for handling sophisticated, complex data models that require many tables, foreign key values, complex join operations, and so on.
Data integrity: The RDBMS features many components designed to ensure data integrity. This includes rollback operations, referential integrity, and transaction-oriented operations.

Another Answer

RDBMS stands for Relational Database Management System. RDBMS store the data into the collection of tables, which is related by common fields between the columns of the table. It also provides relational operators to manipulate the data stored into the tables.

Example: SQL Server.

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806. What is a database table?

# Tutorial: Create table

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807. How to create a table in SQL?

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808. How to delete a table in SQL Server?

Answer:

To delete a table in SQL Server, you can use the DROP TABLE statement. Make sure you have the necessary permissions to perform this action, as it will permanently remove the table and its data from the database. Here's the basic syntax:


DROP TABLE [schema_name.]table_name;

Replace schema_name with the name of the schema where the table resides (if applicable), and replace table_name with the name of the table you want to delete.

For example, to delete a table named "Employees" from the "dbo" schema:


DROP TABLE dbo.Employees;

If the table has any associated constraints, triggers, or indexes, you may need to drop those objects first before you can successfully delete the table. Be cautious when using this command, as data loss is irreversible.

Remember to take a backup of your database before performing any critical operations like dropping a table, especially in a production environment.

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809. How to update a database table using SQL?

Answer:

To update an existing Table we use SQL Command UPDATE: It will update the records as per user defined query/need.


Update TableName SET ColumnName = NewData where Condition   
Update info Set City = 'Baroda' where id = 2

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810. What is a database relationship?

Answer:

Relationships are created by linking the column in one table with the column in another table. There are four different types of relationship that can be created.

The relationships are listed below:

One to One Relationship
Many to One relationship
Many to Many relationship
One to One relationship

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811. What is a primary key of a database?

Answer:

Answer 1:

A table column with this constraint is called the key column for the table. This constraint helps the table to make sure that the value is not repeated and also that there are no null entries. This column does not allow null values and duplicate values. You can try inserting values to violate these conditions and see what happens. A table can have only one Primary key. Multiple columns can participate on the primary key.

Answer 2:

A primary key is a combination of fields which uniquely specify a row. This is a special kind of unique key, and it has implicit NOT NULL constraint. It means, Primary key values cannot be NULL.

A primary key in a database is a unique identifier for a record in a table. It serves two main purposes:

Uniqueness: A primary key ensures that each record in a table is uniquely identifiable. No two records in the table can have the same value for the primary key column(s). This uniqueness helps prevent data duplication and maintains data integrity.
Referential Integrity: A primary key is often used as a reference point for establishing relationships between tables in a relational database. It is used as a foreign key in related tables to create associations and maintain referential integrity. This ensures that data remains consistent across related tables.

Key characteristics of a primary key:

Uniqueness: Each value in the primary key column(s) must be unique across all records in the table.
Non-null: The primary key column(s) cannot contain null values. Every record must have a valid value in the primary key column(s).
Immutable: The values in the primary key column(s) should not change after the record is inserted into the table. This helps maintain the integrity of relationships and references.
Single or Composite: A primary key can consist of one or multiple columns, known as a composite primary key. In a composite primary key, the combination of values across the columns must be unique.

Example: Suppose you have a "Customers" table. You might designate the "CustomerID" column as the primary key. This ensures that each customer has a unique identifier, and you can use this identifier to establish relationships with other tables (e.g., orders, transactions) while maintaining data integrity.

SQL Syntax for creating a primary key:


CREATE TABLE Customers (
    CustomerID INT PRIMARY KEY,
    FirstName VARCHAR(50),
    LastName VARCHAR(50),
    Email VARCHAR(100)
);

In this example, the "CustomerID" column is defined as the primary key of the "Customers" table.

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812. What is a foreign key of a database?

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813. What is database normalization?

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814. What are database normalization forms?

Answer:

Normalization is the process of organizing data into a related table. it also eliminates redundancy and increases the integrity which improves performance of the query. To normalize a database, we divide the database into tables and establish relationships between the tables.

First Normal Form (1NF)
Second Normal Form (2NF)
Third Normal Form (3NF)
Boyce-Codd Normal Form (BCNF)
4th Normal Form
5th Normal Form
6th Normal Form

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815. What is a stored procedure?

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