> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prophecy.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Prophecy In Memory

> Read and write tables to Prophecy In Memory

export const execution_engine_0 = "the SQL warehouse"

<Info>This gem runs in {execution_engine_0}.</Info>

## Overview

In Prophecy, datasets stored in the [SQL Warehouse Connection](/data-analysis/environment/fabrics/prophecy-fabrics) defined in your fabric are accessed using Table gems. Unlike Source and Target gems, Table gems run directly within the data warehouse, eliminating extra orchestration steps and improving performance.

Available configurations for Table gems vary based on your SQL warehouse provider. This page explains how to use the Table gem for a [Prophecy In Memory](/data-analysis/environment/fabrics/prophecy-fabrics) fabric.

## Table types

The following table types are supported.

| Name  | Description                                                                                                   | Type             |
| ----- | ------------------------------------------------------------------------------------------------------------- | ---------------- |
| Table | Persistent storage of structured data in your SQL warehouse. Faster for frequent queries (indexed).           | Source or Target |
| View  | A virtual table that derives data dynamically from a query. Slower for complex queries (computed at runtime). | Source or Target |
| Seed  | Small CSV-format files that you can write directly in Prophecy.                                               | **Source only**  |

## Create a new table

Once you create a Table gem, you can reuse the table throughout your project. All created tables appear in the [Project](/data-analysis/development/studio/studio) tab in the left sidebar.

To create a table in your pipeline:

<Steps>
  <Step title="Add a table gem to the pipeline">
    1. Open your pipeline in the [Studio](/data-analysis/development/studio/studio).
    2. Click on **Source/Target** in the canvas.
    3. Select **Table** from the dropdown.
    4. Click on the gem to open the configuration.
  </Step>

  <Step title="Create a new table">
    Click **+ New Table**. The gem configuration will depend on the table type:

    * [Tables](#tables)
    * [Views](#views)
    * [Seeds](#seeds)
  </Step>
</Steps>

## Gem configuration

### Tables

#### Source parameters

| Parameter  | Description                                                                                                   |
| ---------- | ------------------------------------------------------------------------------------------------------------- |
| Location   | Specify the table's location using the schema and table name. You cannot add or change the database location. |
| Properties | Define or infer schema. Add a description if needed.                                                          |
| Preview    | Load a sample of the data before saving.                                                                      |

#### Target parameters

| Parameter     | Description                                                                                                                                                 |
| ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Location      | Choose the location where the table will be stored. You can create a new table by writing a new table name. You cannot add or change the database location. |
| Properties    | Define certain properties of the table. The schema cannot be changed for target tables.                                                                     |
| Write Options | Select how you want the data to be written each time you run the pipeline. Wipe and Replace Table only.                                                     |

### Views

Views are virtual tables recomputed at runtime from a query.

#### Source parameters

| Parameter  | Description                                          |
| ---------- | ---------------------------------------------------- |
| Location   | Enter the database, schema, and table (view) name.   |
| Properties | Define or infer schema. Add a description if needed. |
| Preview    | Load data based on the view's underlying query.      |

#### Target parameters

| Parameter  | Description                                                                             |
| ---------- | --------------------------------------------------------------------------------------- |
| Location   | Define the name of the view to be created or replaced.                                  |
| Properties | Define certain properties of the table. The schema cannot be changed for target tables. |
| Preview    | Load a preview of the resulting view.                                                   |

<Note>
  Every time the pipeline runs, the target is overwritten. This is because the view is recomputed
  from scratch based on the underlying logic, and any previously materialized results are discarded.
  No additional write modes are supported.
</Note>

### Seeds

Seeds are lightweight CSV datasets defined in your project. Seeds are source-only.

| Parameter  | Description                                                                                                            |
| ---------- | ---------------------------------------------------------------------------------------------------------------------- |
| Properties | Copy-paste your CSV data and define certain [properties](https://docs.getdbt.com/reference/seed-configs) of the table. |
| Preview    | Load a preview of your seed in table format.                                                                           |

<Note>
  The CSV data you define is stored in your Prophecy project files and materialized as a table in
  your data warehouse. This table is created in the [default target
  schema](/data-analysis/environment/connections/databricks#connection-parameters) specified in your
  connection.
</Note>

## Reusing and sharing tables

After you create a table in Prophecy, you can reuse its configuration across your entire project. All created tables appear in the [Project](/data-analysis/development/studio/studio) tab in the left sidebar. To make tables available to other teams, you can share your project as a package in the [Package Hub](/data-analysis/development/extensibility/package-hub/package-hub). Other users will be able to use the shared table configuration if they have access to your fabric via team membership.