Alteryx-Core Data Preparation Practice Question
Exhibit
Field 'ID' contains values: '001', '002', '003'. After using a formula [ID] + 1, the output is '0011', '0021', '0031'.
Refer to the exhibit. What is the most likely cause for this behavior?
⚠ Common exam trap
Candidates often assume the issue is with the formula syntax or a missing value, failing to check the metadata in the input or select tool to identify the incorrect string data type.
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
✓
The field 'ID' is defined as a string type.
The concatenation behavior indicates that 'ID' is treated as a string, and the + operator is performing string concatenation rather than numeric addition. In Alteryx, understanding how operators react to different data types is crucial. This situation demonstrates the importance of verifying data types at the start of a workflow, as unexpected string concatenation is a common source of calculation errors.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The field 'ID' is defined as a numeric type.
Why it's wrong here
If 'ID' were numeric, the + operator would perform standard arithmetic addition. The result '0011' clearly shows that the system is appending the character '1' to the string '001', which confirms that the field must be a string type rather than a numeric type.
- ✓
The field 'ID' is defined as a string type.
Why this is correct
When a field is a string type, the + operator performs concatenation. Since '001' + '1' yields '0011', it is evident that the field type is a string. This demonstrates why it is necessary to convert string identifiers to numbers before performing any mathematical operations.
- ✗
The Formula tool has a bug.
Why it's wrong here
Alteryx is consistent in its treatment of operators. The behavior is not a bug but a direct result of the defined data type. Assuming a tool error instead of a data type mismatch will prevent the developer from identifying the real root cause of the issue.
- ✗
The operator + is overloaded for string types only.
Why it's wrong here
While + performs concatenation on strings, it is not 'overloaded' in a way that suggests a malfunction. It is a standard feature of the expression engine. Attributing this to overloading ignores the fundamental requirement of managing data types correctly to achieve the desired arithmetic results.
About these practice questions
This Alteryx-Core question is part of Courseiva's 142-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Alteryx exam blueprint
This Alteryx-Core practice question is part of Courseiva's free Alteryx 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 Alteryx-Core exam.