How to use Implicit Cursors In SQL

Implicit Cursors are automatically created by Oracle when executing DML statements like INSERT, UPDATE, DELETE, or SELECT INTO. They do not require explicit declaration. The syntax for an Implicit Cursor is as follows:

BEGIN
INSERT INTO employees (employee_id, employee_name, department_id) VALUES (5, 'Sarah', 102);
COMMIT;
END;



Output:

Implicit Cursors Output

Explanation: Inserts a new employee record into the ’employees’ table.

How to Retrieve Data From Multiple Tables Using PL/SQL Cursors

In database programming, the ability to retrieve data from multiple tables is essential for building robust and efficient applications. PL/SQL Cursors is a powerful feature that enables developers to navigate through result sets and make them the best option for querying data from multiple tables.

In this article, We will understand the use of PL/SQL Cursors to retrieve data from multiple tables by understanding the various methods along with the examples and so on.

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How to Retrieve Data from Multiple Tables Using PL/SQL Cursors?

When working with relational databases, it is often necessary to retrieve data from multiple tables to perform complex queries or generate reports. PL/SQL Cursors provide a convenient way to fetch data from multiple tables and process it efficiently. Below are the methods that help us to retrieve data from multiple tables....

1. Using Implicit Cursors

Implicit Cursors are automatically created by Oracle when executing DML statements like INSERT, UPDATE, DELETE, or SELECT INTO. They do not require explicit declaration. The syntax for an Implicit Cursor is as follows:...

2. Using Explicit Cursors

Explicit Cursors are user-defined cursors that offer more control over result set processing. They need to be explicitly declared, opened, fetched, and closed. The syntax for an Explicit Cursor is demonstrated below:...

3. Using Cursor FOR Loops

Cursor FOR Loops simplify the process of fetching data from a cursor by automatically handling opening, fetching, and closing operations. The syntax for a Cursor FOR Loop is illustrated as follows:...

Conclusion

Overall, Retrieving data from multiple tables using PL/SQL Cursors is a powerful feature that allows developers to efficiently fetch and process data from relational databases. By using Implicit Cursors, Explicit Cursors, and Cursor FOR Loops, programmers can perform complex queries and generate reports that involve data from multiple tables....