Add a dataset and preview it

5 min

A dataset is the tabular data you analyze. One collection can hold multiple datasets — this lesson registers your first one, by hand.

Upload a CSV to create a dataset

In the detail screen of the collection you made in Lesson 2, click + Add item ▾ in the header and select Create dataset.

For Source, pick CSV / JSON upload.
Drag-and-drop the CSV file. Files under 50MB are recommended (above that, the ZIP import flow is faster).
When the preview screen comes up, confirm column header detection · encoding (UTF-8 recommended for Korean / international data) · delimiter (comma · tab · etc.).

Click Create at the lower right, and the dataset is registered inside the collection.

Tour the dataset — two tabs

Click the dataset you just made to open the detail screen. Two tabs to know.

Preview tab

The top 100 rows render as a table. The first answer to "what shape did my data actually arrive in". If you see empty cells or broken columns, revisit the upload encoding and delimiter.

Schema tab

You see per-column name · type · comment. CSV uploads auto-infer the type (string / integer / float / boolean / date), and you can fix anything mis-inferred.

Confirm three things.

Column names are English snake_case — not required for the system to work, but it'll be easier in the Analyst / Engineer Paths' code modes.
Type inference matches intent — especially price-style numeric columns mis-inferred as string will block aggregation and charting downstream.
Date columns registered as date or timestamp.

Call global search once

Find the dataset you just registered as if you forgot its name. From anywhere, hit ⌘K (Mac) or Ctrl+K to open global search. Type part of a column name or a tag — the result appears immediately.

Global search is the entry point that finds resources regardless of how deep they sit in the collection tree. No need to drill through trees manually.

What you should be able to do after this lesson

The 3-click flow of CSV upload → dataset registration
Inspect your data's shape via the Preview and Schema tabs
The global search shortcut (⌘K)

Next lesson

Build a first chart with one widget on top of the dataset, and pin it to a dashboard.