🚀 ServiceNow Interview Questions Grind

❓ Q35: What do you mean by Coalesce?

👉 Answer:
Coalesce is a property used in Transform Map field mapping.

📌 How it works:

• If Coalesce = true, the field acts as a unique key.

• When importing data:

  • If a match is found → the existing record is updated.

  • If no match → a new record is created.

💡 Pro Tip: Always choose fields like sys_id or other unique identifiers as coalesce fields to avoid duplicates.

❓ Q36: What are UI Actions?

👉 Answer:
UI Actions allow you to create buttons, links, or context menu items on forms and lists.

📌 Use cases:

• Run a script

• Redirect users

• Trigger workflows

• Automate tasks with one click

❓ Q37: What kind of scripts can we write in UI Actions?

👉 Answer:
UI Actions support both Client-side and Server-side scripts.

• 🖥️ Client-side → Check the Client box → Use an onClick function.
  Example:

   

  function onClickFunction() { alert("Client-side UI Action executed!"); }

• ⚙️ Server-side → Write logic directly in the UI Action script field.
  Example:

   

  current.state = 3; current.update();

📌 Pro Tip: If your logic needs database operations → use Server-side. If it’s form manipulation → use Client-side.

❓ Q38: What are UI Policies?

👉 Answer:
UI Policies are alternatives to Client Scripts that allow you to dynamically change form behavior.

📌 You can:

• Make fields mandatory

• Set fields read-only

• Show/Hide fields

💡 Pro Tip: Always prefer UI Policies over Client Scripts for simple form logic because they are easier to maintain.

❓ Q39: Can we do scripting in UI Policies?

👉 Answer:
✅ Yes.
When you tick the Advanced checkbox, you get a script field where you can write client-side code.

📌 Example:

❓ Q40: What is a Data Policy?

👉 Answer:
A Data Policy enforces field requirements (mandatory, read-only) at the server-side level.

📌 Key Difference vs UI Policy:

• UI Policy → Enforces rules in the form (client-side).

• Data Policy → Enforces rules during record insertion/update from web services, imports, or other integrations.

📌 Example:
If a mandatory field is empty in an import set → Data Policy will block the insert/update.