Tutorial 1: Create and manage databases, schemas, and tables¶

Introduction¶

In this tutorial, you learn how to submit REST queries to create and manage databases, tables, and schemas.

Prerequisites¶

Note

If you have already completed the steps in Common setup for Snowflake REST APIs tutorials, you can skip these prerequisites and proceed to the first step of this tutorial.

Before you start this tutorial, you must complete the common setup instructions, which includes the following steps:

Import the Snowflake REST APIs Postman collections.

Authenticate your connection by setting the bearer token in Postman.

After completing these prerequisites, you are ready to start using the API.

Create a database and list available databases¶

You can use Postman to create a database and list available databases.

To create a database, send a POST request with the following request body to the /api/v2/databases endpoint, as shown.

{
  "name": "demo_db",
  "kind": "PERMANENT",
  "comment": "snowflake rest api demo-db",
  "data_retention_time_in_days": "1",
  "max_data_extension_time_in_days": "1"
}

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To list available databases, send a GET request to the /api/v2/databases endpoint, as shown in the following examples:
- To find databases whose name contains the string, demo, specify %25demo%25 in the like query parameter.
- To return the first database whose name starts with the string, DEMO_DB, specify DEMO_DB and 1 in the startsWith and showLimit query parameters, respectively.

For more information, see the Snowflake Database API reference.

Create a schema and list available schemas¶

You can use Postman to create a schema and list available schemas.

To create a schema, send a POST request to the /api/v2/databases/{database}/schemas endpoint, as follows:
1. Add the database name (demo_db) to the database path variable in the request header.
2. Add the schema name (demo_sc) to the request body.
  { "name": "demo_sc", }
  
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To list available schemas, send a GET request to the /api/v2/databases/{database}/schemas endpoint. In this example, you return the first schema whose name starts with the string, DEMO_SC, by specifying DEMO_SC and 1 in the startsWith and showLimit query parameters, respectively.

For more information, see the Snowflake Schema API reference.

Create a table and fetch the table details¶

You can use Postman to create a table and list available tables.

To create a table, send a POST request to the /api/v2/databases/{database}/schemas/{schema}/tables endpoint, as follows:
1. Add the database name (demo_db) and the schema name (demo_sc) in the database and database path variables, respectively, in the request header.
2. Add the table name (demo_tbl) and the table columns to the request body. In this case, you added one column named C1.
  { "name": "demo_tbl", "columns": [ { "name": "c1", "datatype": "integer", "nullable": true, "comment": "An integral value column" } ], "comment": "Demo table for Snowflake REST API" }
  
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To fetch the table you just created, send a GET request to the /api/v2/databases/{database}/schemas/{schema}/tables/{name} endpoint. In this case, you specify demo_db, demo_sc, and demo_tbl in the database, schema and name path variables, respectively.

For more information, see the Snowflake Table API reference.

Alter a table and fetch the table details¶

You can use Postman to alter a table.

To alter the table you created in the last tutorial, send a PUT request to the /api/v2/databases/{database}/schemas/{schema}/tables/{name} endpoint, as follows:

Specify the names of the database, schema, and table you created in the corresponding path variables.

In the request body, enter the new table definition. In this case, you add a new column to the table.

{
  "name": "demo_tbl",
  "columns": [
    {
    "name": "c1",
    "datatype": "integer",
    "nullable": true,
    "comment": "An integral value column"
    },
    {
    "name": "c2",
    "datatype": "string",
    "comment": "An string value column"
    }
  ],
  "comment": "Demo table for Snowflake REST API"
}

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../../../_images/create-alter-schema-table2.png

Verify the change by fetching the table details by sending a GET request to the /api/v2/databases/{database}/schemas/{schema}/tables/{name} endpoint. In this case, you specify demo_db, demo_sc, and demo_tbl in the database, schema and name path variables, respectively.

Notice the table now contains a new C2 column.

For more information, see the Snowflake Table API reference.

List available tables¶

You can use the /api/v2/databases/{database}/schemas/{schema}/tables endpoint to return lists of all tables available to you.

To list all available tables, send a GET request to the /api/v2/databases/{database}/schemas/{schema}/tables endpoint with no query parameters, as follows. In this case, you specify demo_db and demo_sc, and demo_tbl in the database, schema and name path variables, respectively.
To list full details of the columns and constraints in every table, add the recursive query parameter and set the value to true, as shown. Be aware that enabling this query parameter can overwhelm your connection if you have multiple complex tables.

For more information, see the Snowflake Table API reference.