# Copy on write (CoW) create table examples
<a name="querying-hudi-copy-on-write-create-table-examples"></a>

If you have Hudi tables already created in AWS Glue, you can query them directly in Athena. When you create partitioned Hudi tables in Athena, you must run `ALTER TABLE ADD PARTITION` to load the Hudi data before you can query it.

## Nonpartitioned CoW table
<a name="querying-hudi-nonpartitioned-cow-table"></a>

The following example creates a nonpartitioned CoW table in Athena.

```
CREATE EXTERNAL TABLE `non_partition_cow`(
  `_hoodie_commit_time` string,
  `_hoodie_commit_seqno` string,
  `_hoodie_record_key` string,
  `_hoodie_partition_path` string,
  `_hoodie_file_name` string,
  `event_id` string,
  `event_time` string,
  `event_name` string,
  `event_guests` int,
  `event_type` string)
ROW FORMAT SERDE
  'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe'
STORED AS INPUTFORMAT
  'org.apache.hudi.hadoop.HoodieParquetInputFormat'
OUTPUTFORMAT
  'org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat'
LOCATION
  's3://amzn-s3-demo-bucket/folder/non_partition_cow/'
```

## Partitioned CoW table
<a name="querying-hudi-partitioned-cow-table"></a>

The following example creates a partitioned CoW table in Athena.

```
CREATE EXTERNAL TABLE `partition_cow`(
  `_hoodie_commit_time` string, 
  `_hoodie_commit_seqno` string, 
  `_hoodie_record_key` string, 
  `_hoodie_partition_path` string, 
  `_hoodie_file_name` string, 
  `event_id` string, 
  `event_time` string, 
  `event_name` string, 
  `event_guests` int)
PARTITIONED BY ( 
  `event_type` string)
ROW FORMAT SERDE 
  'org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe' 
STORED AS INPUTFORMAT 
  'org.apache.hudi.hadoop.HoodieParquetInputFormat' 
OUTPUTFORMAT 
  'org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat' 
LOCATION
  's3://amzn-s3-demo-bucket/folder/partition_cow/'
```

The following `ALTER TABLE ADD PARTITION` example adds two partitions to the example `partition_cow` table.

```
ALTER TABLE partition_cow ADD
  PARTITION (event_type = 'one') LOCATION 's3://amzn-s3-demo-bucket/folder/partition_cow/one/' 
  PARTITION (event_type = 'two') LOCATION 's3://amzn-s3-demo-bucket/folder/partition_cow/two/'
```