Amazon Redshift will no longer support the creation of new Python UDFs starting Patch 198. Existing Python UDFs will continue to function until June 30, 2026. For more information, see the [ blog post ](https://aws.amazon.com/blogs/big-data/amazon-redshift-python-user-defined-functions-will-reach-end-of-support-after-june-30-2026/). 

# SLICE\$1NUM Function
<a name="r_SLICE_NUM"></a>

Returns an integer corresponding to the slice number in the cluster where the data for a row is located. SLICE\$1NUM takes no parameters. 

## Syntax
<a name="r_SLICE_NUM-syntax"></a>

```
SLICE_NUM()
```

## Return type
<a name="r_SLICE_NUM-return-type"></a>

The SLICE\$1NUM function returns an integer. 

## Examples
<a name="r_SLICE_NUM-examples"></a>

The following example shows which slices contain data for the first ten EVENT rows in the EVENTS table: 

```
select distinct eventid, slice_num() from event order by eventid limit 10;

 eventid | slice_num
---------+-----------
       1 |         1
       2 |         2
       3 |         3
       4 |         0
       5 |         1
       6 |         2
       7 |         3
       8 |         0
       9 |         1
      10 |         2
(10 rows)
```

The following example returns a code (10000) to show that a query without a FROM statement runs on the leader node: 

```
select slice_num();
slice_num
-----------
10000
(1 row)
```