1z0-771 Oracle APEX Cloud Developer Professional Questions and Answers

Workflow parameters and page items in APEX support:

B. NUMBER: For numeric values (e.g., 123.45), used in calculations or IDs.

C. CLOB: For large text (e.g., descriptions), stored as character large objects.

D. VARCHAR: For variable-length strings (e.g., EMPLOYEE_NAME), capped at 4000 characters in most cases.

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) executedat 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).

Declarative options for downloading BLOB/CLOB content include:

Download Dynamic Action: A built-in action type to trigger downloads of BLOB/CLOB data.

In Oracle APEX Workflow, onlyone instanceof a workflow can exist in the "In Development" state at a time. This ensures that developers work on a single draft version before publishing it. Multiple instances are allowed in other states (e.g., "Published"), but not during development.

To send push notifications to all subscribed users, you must:

Enable push notifications at the application level (a prerequisite).

Data Workshop in SQL Workshop is a powerful tool for importing/exporting table data:

B. You can load or unload a single table at a time: The wizard focuses on one table per operation. For loading, you upload a file (e.g., CSV) and map it to a single table; for unloading, you select one table to export (e.g., EMP to CSV). This granularity ensures precision and simplicity.

C. You can unload data from a new or existing table: Unloading (exporting) works on any table in the schema, whether newly created (e.g., via Quick SQL) or pre-existing (e.g., DEPT). The "Unload" option generates a file (e.g., CSV, JSON) from the table’s data.

D. You can load data into a new or existing table: Loading supports creating a new table from the uploaded file (e.g., CSV defines NEW_EMP) or appending/overwriting an existing one (e.g., EMP). The wizard prompts for table creation or selection.

Working Copies in APEX allow safe experimentation:

C. Get the latest updates from the Main application: "Refresh Working Copy" (in App Builder > Working Copies) pulls changes from the Main application into the Working Copy, ensuring it reflects the latest state (e.g., new pages, fixes) without overwriting Working Copy changes.

A. Merge with Main: Merging is a separate "Merge Working Copy" task.

To use REST-enabled SQL in APEX:

Install ORDS 19.x or later: Oracle REST Data Services (ORDS) must be installed and configured on the remote database.

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.

The "Check Syntax" process in APEX, typically used in SQL Workshop or when validating code, authenticates usingDatabase schema credentials. These are the credentials of the schema associated with the APEX workspace (e.g., username/password of the schema like "HR"). This ensures the process has access to parse and validate SQL or PL/SQL against the database objects in that schema.

APEX Workspace Admin credentials: These are for managing workspaces, not executing database-level syntax checks.

Dynamic Actions in APEX enable responsive behavior:

If a client-side condition is defined, the true action will fire when the condition is met: A condition (e.g., this.browserEvent === 'click') ensures the true action (e.g., Show, Hide) executes only when true, enhancing precision in event handling.

You can execute JavaScript code by creating a dynamic action: The "Execute JavaScript Code" action type allows custom scripts (e.g., alert('Clicked!');), extending functionality beyond declarative options.

Cannot add more true actions: False; multiple true actions can be added post-creation.

To enable an existing APEX application as a Progressive Web App (PWA), the mandatory step is:

Enable the PWA flag in the Application Definition: In the Application Definition attributes under "Progressive Web App," setting "Enable PWA" to "Yes" activates PWA features like installability, push notifications, and service worker generation. This is the foundational step, after which optional customizations (e.g., icons, manifest) can be added.

Friendly URLs: While recommended for modern apps, they’re not required for PWA functionality.

Custom JavaScript: Optional for offline capabilities, but not mandatory for basic PWA enablement.