> ## Documentation Index > Fetch the complete documentation index at: https://docs.summation.com/llms.txt > Use this file to discover all available pages before exploring further. # Data table > A hand-authored Summation table you fill in and maintain yourself. A **data table** is a hand-authored [Summation table](/features/tables) — a grid you fill in and maintain yourself. Reach for one when you want reference or master data, a manually curated list, or any dataset you'd rather enter by hand than import or compute. **What you can do** * Edit rows directly in the grid — add, update, and delete. * Add columns of any type (Text, Integer, Number, Date, Boolean), plus **SQL / computed** columns and **Dimension** columns that reference a [dimension table](/features/tables/dimension). * Mark one column as the table's **key** with the **Set as key** radio in the grid. (The `primary_key` is shown read-only, and "business keys" is only a backend parameter on the upsert path — neither is set here.) ## Create a data table On the [Tables](/features/tables) page, click **Create → Data Table**. You land on the table's grid, where the **+ Add** column menu adds typed or computed columns and you enter rows. A data table 'DemoDataTable' with a '# Height' column and a '+ Add' column button; the Add-column menu lists SQL, Dimension, Boolean, Date, Integer, Number, and Text. Append 1–500 rows per request; every row must include the table's primary key column(s) (a `400` otherwise). Returns `200` when all rows apply, `207` for a partial result, or `422`; a `409` means the table isn't promoted yet. Requires the `tables:append` scope. Upsert rows (insert or update by key) — same 1–500 row limit and `tables:append` scope. Start a batched (multipart) ingestion for larger loads. Get a presigned URL to upload one part of a batch. Commit the batch to apply its rows. Abort a batch and discard its parts. Requires the `tables:append` scope and `confirm=true`. Check a batch's status. Create a data table.