computed-columns

name	computed-columns
description	Create computed columns in Glide - Math, If-Then-Else, Relations, Rollups, Lookups, Templates. Use when adding calculations, formulas, lookups, or linking tables with relations.

Glide Computed Columns

Glide uses computed columns instead of cell formulas. Each computed column applies its logic to every row in the table.

Key Concept

Calculations in Glide are columns, not cell formulas. You build complex logic by chaining columns together - one column's output becomes another column's input.

Creating Computed Columns

1. In Data Editor, click a column header → "Add column right"
2. Name the column
3. Click the Type dropdown
4. Use the filter - type the column type (e.g., "math", "relation", "if-then") to find it quickly
5. Configure the column settings
6. Save

Math Columns

For arithmetic calculations.

Important: Use plain, human-readable column names as variables. No special escaping or symbols needed.

Example - calculating a total:

• Column A: "Quantity"
• Column B: "Unit Price"
• Math column formula: Quantity * Unit Price

Just type the column names naturally. Glide will recognize them.

Other examples:

• Price * 1.1 (add 10% markup)
• Total / Count (calculate average)
• End Date - Start Date (days between dates)
• Amount - Discount (apply discount)

Configure formatting: After creating a math column, set up proper display formatting:

• Decimal places: 0 for counts, 2 for currency
• Prefix: $ or € for money
• Suffix: %, kg, mi, hrs for units
• Thousands separator: Enable for large numbers

This makes the data instantly readable (e.g., "$1,234.56" instead of "1234.56").

If-Then-Else Columns

For conditional logic. Returns different values based on conditions.

Structure:

• IF [condition]
• THEN [value if true]
• ELSE [value if false]

Examples:

• Status emoji: IF Status is "Complete" THEN "✅" ELSE IF Status is "In Progress" THEN "🔄" ELSE "⏳"
• Priority color: IF Priority is "High" THEN "🔴" ELSE IF Priority is "Medium" THEN "🟡" ELSE "🟢"
• Overdue flag: IF Days Until Due < 0 THEN "Overdue" ELSE "On Track"
• Discount tier: IF Total > 1000 THEN "Gold" ELSE IF Total > 500 THEN "Silver" ELSE "Bronze"

You can chain multiple If-Then-Else for complex logic, or nest them.

Relation Columns

Connect rows between tables based on matching values.

Setup:

1. Create a Relation column
2. Select the target table
3. Choose which columns to match (e.g., "Customer ID" in Orders matches "ID" in Customers)

Types:

• Single relation: Returns one matching row
• Multiple relation: Returns all matching rows (for one-to-many)

Use relations to enable Lookups and Rollups.

Lookup Columns

Pull a value from a related row.

Setup:

1. Create a Lookup column
2. Select a Relation column as the source
3. Choose which column to pull from the related table

Example:

• Orders table has Relation to Customers
• Lookup column pulls "Customer Name" from the related Customer row
• Now each order shows the customer's name

Rollup Columns

Aggregate values across related rows.

CRITICAL CONCEPT: Rollups should almost always operate on a Relation column, not an entire table. This is because rollups on relations automatically filter to only the related rows.

Why Use Relations with Rollups

The pattern:

Relation Column → Rollup Column (operates on the relation)

What happens:

• Rollup on a Relation: Counts/sums/averages only the rows that are related
• Rollup on a Table: Counts/sums/averages ALL rows in that table (rarely useful)

Example: Order System

Tables:

• Orders table
• Order Items table

Goal: Count how many items are in each order

❌ WRONG approach:

In Orders table:
  Rollup column → Select "Order Items" table → Count rows

Result: Every order shows the TOTAL count of all items in the entire table

✅ RIGHT approach:

In Orders table:
  Step 1: Relation column → Match Order ID to Order Items table
  Step 2: Rollup column → Select the Relation column → Count

Result: Each order shows only its own item count

Example: CRM System

Goal: In Companies table, show count of contacts and sum of deal amounts

✅ Correct setup:

Companies table:
  1. Relation: "Related Contacts" → Links to Contacts where Company ID matches
  2. Rollup: "Contact Count" → Operates on "Related Contacts" relation → Count

  3. Relation: "Related Deals" → Links to Deals where Company ID matches
  4. Rollup: "Total Deal Amount" → Operates on "Related Deals" relation → Sum of Amount

When to Use Rollup on Whole Table

Rarely needed, but valid when:

• You want a constant value (e.g., "Total Users" displayed on every row)
• You're creating a dashboard row that shows global stats

Example:

Dashboard table (single row):
  Rollup → Select Users table → Count rows
  Result: Shows total user count

Setup Steps

1. Create a Relation column first (unless using whole table)
2. Create a Rollup column
3. Select the Relation column as the source (not the table directly)
4. Choose the aggregation: Count, Sum, Average, Min, Max
5. Select which column to aggregate (for Sum/Average/Min/Max)

Common Rollup Patterns

Pattern	Relation	Rollup Configuration
Count tasks per project	Project → Tasks	Count rows in relation
Sum order amounts per customer	Customer → Orders	Sum of "Amount" column
Average rating per product	Product → Reviews	Average of "Rating" column
Max price in category	Category → Products	Max of "Price" column
Count activities per contact	Contact → Activities	Count rows in relation

Template Columns

Combine text and column values into formatted strings.

Example:

• Template: Hello, {Name}! Your order total is ${Total}.
• Columns can be inserted with the column picker

Great for:

• Formatted display text
• Email/message templates
• Generating URLs with dynamic values

Experimental Columns

Hero Icons

Generate icons from the Hero Icons library.

• Input: Icon name (e.g., "check-circle", "user", "folder")
• Output: Image URL for the icon
• Combine with If-Then-Else for dynamic icons based on status

Generate Text (AI)

Use AI to generate text based on other columns.

• Configure a prompt that references column values
• AI generates text for each row

Other AI Columns

• Image to Text: Extract text/info from images
• Text to Choice: AI categorization
• Text to Boolean: AI yes/no classification

Column Chaining Pattern

Build complex calculations by chaining simple columns:

Example: Order Status with Emoji

1. Relation: "Customer" → links to Customers table
2. Lookup: "Customer Name" → pulls name via Customer relation
3. Math: "Days Until Due" → Due Date - Today
4. If-Then-Else: "Is Overdue" → IF Days Until Due < 0 THEN true ELSE false
5. If-Then-Else: "Status Emoji" → IF Is Overdue THEN "🚨" ELSE IF Status = "Complete" THEN "✅" ELSE "📋"

Each column does one thing, and they build on each other.

Big Table Limitations

When using Big Tables (not native Glide Tables), computed columns have limitations for filtering, sorting, and rollups.

Supported for filtering/sorting/rollups in Big Tables:

• Math columns
• If-Then-Else columns
• Lookup columns (single relation, basic columns only)
• Template columns (static template string only)

NOT supported for filtering/sorting/rollups in Big Tables:

• Rollup columns
• Multi-relation columns
• Query columns
• Plugin-based columns

Lookup requirements in Big Tables:

• Single relation only (not multi-relation)
• Relation column must be basic (non-computed)
• Target table must be a Big Table
• Target column must be basic (non-computed)
• Target column cannot be user-specific

Template requirements in Big Tables:

• Template string must be constant (not computed)

Rollup/Lookup row limit: Maximum 100 matching rows in Big Tables.

See the data-modeling skill for full Big Table documentation.

Tips

• Name columns clearly - they become variables in other calculations
• Use the type filter - faster than scrolling through menus
• Chain simple columns - easier to debug than one complex column
• Test with sample data - verify calculations work before adding more
• Consider Big Table limits - if using Big Tables, check column type compatibility