Tableau CONTAINS Function Tool

Interactive Tableau CONTAINS Function Builder

Chart comparing the character length of the Main String vs. the Substring.

What is the CONTAINS function in a Tableau Calculated Field?

The Tableau CONTAINS function is a powerful logical tool used within a calculated field to determine if a specific sequence of characters (a substring) exists within a larger text field (a string). It returns a simple boolean value: `TRUE` if the substring is found, and `FALSE` if it is not. Knowing how to use contains in a tableau calculated field is fundamental for anyone performing text analysis, data cleaning, or creating dynamic segments in their visualizations. This function is the equivalent of a “find” or “search” operation performed across every row of your data source simultaneously.

Data analysts, business intelligence professionals, and marketers should all learn how to use contains in a tableau calculated field. It is essential for tasks like categorizing products based on keywords in their descriptions, flagging customer comments that mention specific terms like “delay” or “support,” or grouping campaign data by channel names embedded in a string.

A common misconception is that CONTAINS is case-sensitive. By default, it is not, which is often an advantage. For instance, `CONTAINS(“Tableau Rocks”, “tableau”)` will return `TRUE`. Another point of confusion is its difference from the `FIND()` function; while CONTAINS returns a simple TRUE/FALSE, `FIND()` returns the numerical starting position of the substring, which is useful for more complex string manipulations.

Tableau CONTAINS Formula and Mathematical Explanation

The syntax for the function is remarkably simple, which makes learning how to use contains in a tableau calculated field very accessible. The formula requires just two arguments.

CONTAINS(string, substring)

Here is a step-by-step breakdown of how Tableau processes this function:

1. Identify the String: Tableau first looks at the `string` argument. This is typically a dimension from your data source, like `[Product Name]` or `[Customer Feedback]`.
2. Identify the Substring: Next, it takes the `substring` argument, which is the specific text you are searching for, written inside quotes (e.g., `”Organic”`).
3. Perform the Search: For each row in your data, the function scans the `string` from beginning to end to see if the exact sequence of characters in the `substring` appears anywhere within it.
4. Return the Result: If a match is found, the calculated field outputs `TRUE` for that row. If no match is found, it outputs `FALSE`.

This simple TRUE/FALSE output is perfect for use in other logical statements, like an IF/THEN/ELSE block or a CASE statement, allowing for powerful and dynamic data segmentation.

Variables in the CONTAINS Function

Variable	Meaning	Data Type	Typical Example
string	The main text field to be searched.	String	`[Product Description]`
substring	The specific text to search for.	String (Literal)	`”electronics”`
(output)	The result of the check.	Boolean	`TRUE` or `FALSE`

Practical Examples (Real-World Use Cases)

Example 1: Segmenting Marketing Campaigns

Imagine you have a `[Campaign Name]` field with values like “Q4_Facebook_HolidaySale” and “Q4_Google_BrandAwareness”. You want to group these by channel. Learning how to use contains in a tableau calculated field is perfect for this.

• Inputs:
  • String: `[Campaign Name]`
  • Substring: `”Facebook”`
• Tableau Calculation: A new calculated field named “Is Facebook Campaign?” with the formula:
  IF CONTAINS([Campaign Name], "Facebook") THEN "Facebook" ELSE "Other" END
• Interpretation: This calculation creates a new dimension you can use to easily compare the performance of Facebook campaigns against all others. You could expand this with `ELSEIF CONTAINS(…)` for Google, LinkedIn, etc., demonstrating a more advanced application of how to use contains in a tableau calculated field.

Example 2: Identifying High-Priority Customer Support Tickets

A support team wants to flag all tickets where the customer mentions “urgent” or “escalate” in their feedback. This helps prioritize their queue.

• Inputs:
  • String: `[Ticket Comment]`
  • Substrings: `”urgent”`, `”escalate”`
• Tableau Calculation: A new calculated field named “Priority Flag” with the formula:
  IF CONTAINS([Ticket Comment], "urgent") OR CONTAINS([Ticket Comment], "escalate") THEN "High Priority" ELSE "Standard" END
• Interpretation: This formula effectively tags tickets for immediate review. This showcases how to combine the CONTAINS function with an OR operator to check for multiple keywords, a crucial skill for mastering advanced Tableau calculations.

How to Use This Tableau CONTAINS Calculator

This interactive tool simplifies the process of learning how to use contains in a tableau calculated field by providing instant feedback and generating the correct syntax.

1. Enter the Main String: In the first input box, type the text you want to search within. This simulates your data field, like `[Product Category]`.
2. Enter the Substring: In the second box, type the keyword you are searching for.
3. Review the Live Results: The calculator instantly updates. The primary result shows whether the substring was found (`TRUE`) or not (`FALSE`).
4. Copy the Formula: The “Generated Tableau Formula” box provides the exact syntax you need to copy and paste into your Tableau calculated field editor. This is a core feature for understanding how to use contains in a tableau calculated field correctly.
5. Analyze the Chart: The bar chart provides a visual representation of the character counts, which can be useful for understanding the relative size of your strings.
6. Reset or Copy: Use the “Reset” button to return to the default example or “Copy Results” to save the current inputs, formula, and result to your clipboard.

Key Factors That Affect CONTAINS Function Results

While the function is straightforward, several factors can influence its behavior and performance. A deep understanding is key for anyone serious about how to use contains in a tableau calculated field effectively.

• Case Sensitivity: By default, CONTAINS is case-insensitive. If you need a case-sensitive search, you must use the `FIND()` function, such as `FIND([Field], “Keyword”) > 0`.
• Data Performance: Running string functions on massive datasets can impact dashboard performance. For live connections, the work is done by the database. Using a Tableau Hyper extract can improve speed, as the calculations can be materialized.
• Leading/Trailing Spaces: Spaces can cause unexpected `FALSE` results. For example, `CONTAINS(” Apple “, “Apple”)` is `TRUE`, but if you were searching for `” Apple “` (with spaces), it might fail. It’s often wise to use the `TRIM()` function (`TRIM([Field])`) to clean your data first.
• Combining with Logical Operators: The power of the CONTAINS function is amplified when used with `IF`, `AND`, `OR`, and `NOT`. This allows for complex, multi-condition filtering and segmentation. Mastering how to use contains in a tableau calculated field means mastering these combinations.
• Use with Parameters: You can make your search dynamic by replacing the hardcoded substring with a parameter. For example, `CONTAINS([Product Name], [Product Search Parameter])` lets users type their own search term into a control on the dashboard.
• Alternative Functions: For certain use cases, `STARTSWITH()` or `ENDSWITH()` are more efficient and specific. If you only need to match text at the beginning or end of a string, use these functions instead of CONTAINS for better clarity and potentially better performance.

Frequently Asked Questions (FAQ)

1. Is the Tableau CONTAINS function case-sensitive?

No, by default, CONTAINS is not case-sensitive. `CONTAINS(“Tableau”, “tableau”)` returns `TRUE`. If you require case sensitivity, you should use the `FIND` function.

2. Can I search for multiple substrings at once?

Yes, by combining the function with the `OR` operator. For example: `CONTAINS([Field], “apple”) OR CONTAINS([Field], “orange”)`.

3. How is CONTAINS different from FIND?

CONTAINS returns a boolean (`TRUE`/`FALSE`), indicating if a match exists. `FIND` returns a number representing the starting position of the match (or `0` if not found). A key lesson in how to use contains in a tableau calculated field is knowing which one to use.

4. Will the CONTAINS function slow down my dashboard?

On very large datasets, any string calculation can impact performance. To mitigate this, use a Tableau Extract to materialize the calculation, apply filters to reduce the data being processed, and follow Tableau performance best practices.

5. Can I use wildcards with the CONTAINS function?

The CONTAINS function itself acts like a wildcard search and does not require wildcard characters like `*` or `%`. The substring you provide is what it looks for anywhere in the main string.

6. How do I handle extra spaces in my data?

It is a best practice to clean your fields using `TRIM()`, `LTRIM()`, or `RTRIM()` before applying a CONTAINS check. For example: `CONTAINS(TRIM([Field]), “keyword”)`.

7. What’s a common error when learning how to use contains in a tableau calculated field?

A frequent mistake is forgetting the quotes around the substring literal. The formula `CONTAINS([Field], Apple)` will cause an error; it must be `CONTAINS([Field], “Apple”)`.

8. Can I use CONTAINS to create a filter?

Absolutely. The most common use is to drag the calculated field (which returns TRUE/FALSE) onto the Filters shelf and select `TRUE`. This filters the view to only show rows that contain your substring.

Related Tools and Internal Resources

• Tableau Date Functions Guide: An overview of manipulating dates in calculated fields.
• Advanced Guide to IF Statements: Learn to combine CONTAINS with complex conditional logic.
• Top 10 Tableau Performance Tips: Essential reading for optimizing workbooks with complex calculations.
• Level of Detail (LOD) Expression Builder: Explore how to use LODs for more advanced cohort analysis.
• Tableau vs. Power BI Comparison: A comprehensive look at the leading BI tools.
• Mastering Advanced Tableau Calculations: A deep dive into functions beyond the basics.