Many-to-Many Relationships in ServiceNow — Valid Approaches
An administrator is designing a data model to manage vendor contracts. The solution must allow contracts to be associated with multiple departments and multiple vendors. Which THREE approaches are valid to model this many-to-many relationship in ServiceNow? (Choose three.)
Quick Answer
A multi-reference field is a valid way to model this relationship because it is a field type ServiceNow specifically built to hold multiple references to another table at once, which is exactly what a many-to-many relationship requires: one contract needs to point to several departments simultaneously, and a single reference field cannot do that since it can only hold one related record. This is one of three legitimate approaches for this kind of modeling, alongside creating a proper intermediate table with reference fields on each side, the standard relational pattern, and using a GlideList field, which similarly allows multiple stored references in one field. What ties all three valid options together is that they store the relationships in a structured, queryable way that preserves data integrity, which is precisely what rules out the invalid options here: a single Department reference field cannot hold more than one department, and storing comma-separated sys_ids in a plain String field abandons ServiceNow's referential structure entirely, making the data hard to query, report on, or validate. Whenever a question asks you to model a many-to-many relationship, look for answers using dedicated relationship-capable field types or a true intermediate table, and rule out any option that forces multiple related records into a single-reference field or an unstructured text field, since both break the platform's ability to treat those relationships as real data.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an intermediate table 'ContractDepartment' with reference fields to Contract and Department
Options A, C, and D are valid approaches for modeling a many-to-many relationship in ServiceNow. Option A creates an intermediate table with reference fields, which is a standard relational method. Option C uses a GlideList field, which allows storing multiple references in a single field and can be used for many-to-many relationships. Option D uses a multi-reference field, which is specifically designed for many-to-many relationships. Option B is invalid because a single 'Department' field cannot store multiple records. Option E is invalid because storing comma-separated sys_ids in a String field is not a recommended practice and breaks data integrity.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Create an intermediate table 'ContractDepartment' with reference fields to Contract and Department
Why this is correct
An intermediate table is the standard relational database approach for many-to-many relationships.
- ✗
Create a single 'Department' field on the Contract table and use it to store all department records
Why it's wrong here
A single reference field can only store one record; it cannot handle multiple associations.
- ✓
Use a 'GlideList' field type on the Contract table to reference multiple departments
Why this is correct
GlideList fields are designed to hold multiple references and support dot-walking and queries.
- ✓
Use a 'Multi-reference field' (sys_multi_reference) on the Contract table to reference multiple departments
Why this is correct
Multi-reference fields can store multiple references to another table without creating an intermediate table.
- ✗
Use a 'String' field on the Contract table to store a comma-separated list of department sys_ids
Why it's wrong here
Storing sys_ids as a string violates data normalization and makes querying and reporting difficult.
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Same concept, more angles
1 more way this is tested on SNOW-CAD
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company needs to store data about employee certifications. Each employee may have multiple certifications. Which approach is best practice?
easy- A.Add a multi-select field to the User table to store certification IDs
- ✓ B.Create a new custom table with a reference field to the User table
- C.Extend the User table to store certification fields directly
- D.Create a database view that joins User and certification data
Why B: Creating a new table with a reference field to the User table allows storing multiple certification records per employee without adding unnecessary fields. Option A is wrong because a multi-select field on the User table cannot effectively store multiple certification records and lacks relational integrity. Option C is wrong because extending the User table would add many unwanted fields from the User table and complicate data management. Option D is wrong because database views are read-only and cannot be used for storing data.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This SNOW-CAD practice question is part of Courseiva's free ServiceNow certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the SNOW-CAD exam.