AWS Documentation » Amazon Athena » User Guide » Getting Started

Getting Started

This tutorial walks you through using Amazon Athena to query data. You'll create a table based on sample data stored in Amazon Simple Storage Service, query the table, and check the results of the query.

The tutorial is using live resources, so you are charged for the queries that you run. You aren't charged for the sample datasets that you use, but if you upload your own data files to Amazon S3, charges do apply.

Prerequisites

If you have not already done so, sign up for an account in Setting Up.

Step 1: Create a Database

You first need to create a database in Athena.

To create a database

1. Open the Athena console.

2. If this is your first time visiting the Athena console, you'll go to a Getting Started page. Choose Get Started to open the Query Editor. If it isn't your first time, the Athena Query Editor opens.

3. In the Athena Query Editor, you see a query pane with an example query. Start typing your query anywhere in the query pane.

   

4. To create a database named mydatabase, enter the following CREATE DATABASE statement, and then choose Run Query:

   CREATE DATABASE mydatabase

5. Confirm that the catalog display refreshes and mydatabase appears in the DATABASE list in the Catalog dashboard on the left side.

   

Step 2: Create a Table

Now that you have a database, you're ready to create a table that's based on the sample data file. You define columns that map to the data, specify how the data is delimited, and provide the location in Amazon S3 for the file.

To create a table

1. Make sure that mydatabase is selected for DATABASE and then choose New Query.

2. In the query pane, enter the following CREATE TABLE statement, and then choose Run Query:

   Note

   You can query data in regions other than the region where you run Athena. Standard inter-region data transfer rates for Amazon S3 apply in addition to standard Athena charges. To reduce data transfer charges, replace myregion in s3://athena-examples-myregion/path/to/data/ with the region identifier where you run Athena, for example, s3://athena-examples-us-east-1/path/to/data/.

   CREATE EXTERNAL TABLE IF NOT EXISTS cloudfront_logs (
     `Date` DATE,
     Time STRING,
     Location STRING,
     Bytes INT,
     RequestIP STRING,
     Method STRING,
     Host STRING,
     Uri STRING,
     Status INT,
     Referrer STRING,
     os STRING,
     Browser STRING,
     BrowserVersion STRING
     ) ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.RegexSerDe'
     WITH SERDEPROPERTIES (
     "input.regex" = "^(?!#)([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+([^ ]+)\\s+[^\(]+[\(]([^\;]+).*\%20([^\/]+)[\/](.*)$"
     ) LOCATION 's3://athena-examples-myregion/cloudfront/plaintext/';

   The table cloudfront_logs is created and appears in the Catalog dashboard for your database.

   

Step 3: Query Data

Now that you have the cloudfront_logs table created in Athena based on the data in Amazon S3, you can run queries on the table and see the results in Athena.

To run a query

1. Choose New Query, enter the following statement anywhere in the query pane, and then choose Run Query:

   SELECT os, COUNT(*) count
   FROM cloudfront_logs
   WHERE date BETWEEN date '2014-07-05' AND date '2014-08-05'
   GROUP BY os;

   Results are returned that look like the following:

   

2. Optionally, you can save the results of a query to CSV by choosing the file icon on the Results pane.

   

You can also view the results of previous queries or queries that may take some time to complete. Choose History then either search for your query or choose View or Download to view or download the results of previous completed queries. This also displays the status of queries that are currently running. Query history is retained for 45 days. For information, see Viewing Query History.

Query results are also stored in Amazon S3 in a bucket called aws-athena-query-results-ACCOUNTID-REGION. You can change the default location in the console and encryption options by choosing Settings in the upper right pane. For more information, see Query Results.