A dynamic List of Values (LOV) in APEX populates options based on a query source. The supported

types include:

Function Returning SQL Query: A PL/SQL function that returns a SQL query string (e.g., RETURN

'SELECT ename, empno FROM emp';). This offers flexibility for dynamic conditions or complex logic.

SQL Query: A direct SQL statement (e.g., SELECT ename, empno FROM emp) executed at runtime to

fetch LOV values. It’s the simplest and most common approach.

Procedure: Procedures execute logic but don’t return query results in the format required for an LOV

(they don’t produce a result set directly).

Select List: This is a UI component, not a query source type for defining an LOV.

Dynamic LOVs enhance user interaction by providing real-time, data-driven options, critical for forms

and filters.

Reference: Oracle APEX 23.2 Documentation - "Managing Lists of Values" under Shared Components.

Page Designer’s layout modes under Utilities adjust the workspace:

A . Two Pane: Splits into two vertical sections (e.g., tree and properties), ideal for focused editing.

B . Three Pane: Adds a third section (e.g., tree, grid, properties), offering a balanced view for complex

pages.

C . Four Pane: Not available; APEX limits to three for usability.

D . Single Pane: Not an option; the minimum is two panes.

Developers toggle these via the Utilities menu to optimize screen real estate based on task

complexity.

Reference: Oracle APEX 23.2 Documentation - "Page Designer Layout" under Utilities.

Logging in APEX tracks runtime activity:

A . apex_automation.log_info: Correctly logs an informational message to the execution log for

automation tasks (e.g., workflows). The syntax || :ENAME || concatenates the item value (e.g.,

"JOHN") into "SAL for JOHN increased by 19." It’s stored in APEX_AUTOMATION_LOG, viewable in

Monitoring.

B . apex_debug.info: Logs to debug output, but the syntax is flawed (:ENAME || isn’t concatenated

properly; should be 'SAL for ' || :ENAME || ...). It’s valid only when debugging is enabled (e.g.,

APEX_DEBUG.ENABLE).

C . apex_error.add_error: Adds an error to the error stack for user display, not a log message.

Technical Insight: log_info is non-intrusive, unlike apex_debug, which requires debug mode, or

apex_error, which signals failure.

Use Case: Logging salary updates in a scheduled job without debug overhead.

Pitfall: Ensure :ENAME is in scope (e.g., page item).

Reference: Oracle APEX 23.2 Documentation - "APEX_AUTOMATION Package" under API Reference.

In SQL Workshop, custom stored procedures can be created using:

SQL Scripts: Allows developers to write and execute PL/SQL code directly to define stored

procedures.

Object Browser: Provides a GUI to create and edit database objects, including stored procedures, by

defining their specifications and bodies.

Quick SQL is for generating table DDL, not stored procedures, and Data Workshop is for

loading/unloading data, not creating procedures.

Reference: Oracle APEX 23.2 Documentation - "SQL Workshop Guide" under SQL Scripts and Object

Browser sections.

Validation errors in APEX default to both inline (next to the item) and notification (top of page):

C . Setting Display Location to Inline in Notification: In the validation’s properties, changing "Display

Location" to "Inline in Notification" ensures the error appears only in the notification area,

suppressing inline display. This centralizes feedback for a cleaner UI.

A . Removing Associated Item: Breaks the validation’s link to P1_SALARY, stopping it entirely.

B . Value Required: Adds a separate check, unrelated to display location.

Pitfall: Test with non-numeric input (e.g., "abc") to confirm behavior.

Reference: Oracle APEX 23.2 Documentation - "Managing Validations" under Page Processing.