A Common Table Expression (CTE) in Oracle PL/SQL is a named temporary result set that you can reference within a SELECT, INSERT, UPDATE, or DELETE statement. It helps in simplifying complex queries and makes the code more readable and maintainable. CTEs were introduced in Oracle 9i. Syntax Here is a basic syntax for creating a…(Continue Reading)

PL/SQL With clause

The WITH clause in Oracle PL/SQL, also known as a Common Table Expression (CTE), is a powerful feature that allows you to define a temporary result set within the scope of a single SQL statement. It enhances the readability and maintainability of complex SQL queries by breaking them into modular, named subqueries. Here’s a breakdown…(Continue Reading)

PL/SQL mutating table error

The mutating table error in Oracle PL/SQL occurs when a trigger or a stored procedure attempts to reference a table that is currently being modified by the same transaction. This error is raised to maintain the integrity of the data and prevent unexpected results that could arise from accessing a table in a state of…(Continue Reading)

PL/SQL After triggers

An AFTER trigger in Oracle PL/SQL is a type of database trigger that is executed automatically after a specified event occurs in a database table. Triggers are special types of stored procedures that are defined to execute automatically in response to certain events on a particular table or view. These events can include INSERT, UPDATE,…(Continue Reading)

PL/SQL Before triggers

Triggers are a fundamental component of Oracle PL/SQL, and they allow developers to define actions that automatically execute in response to certain events on a particular table or view. Before triggers are a type of trigger that fires before the triggering event, providing developers with the opportunity to intervene and modify data before the action…(Continue Reading)