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Amazon Redshift will no longer support the creation of new Python UDFs starting November 1, 2025. If you would like to use Python UDFs, create the UDFs prior to that date. Existing Python UDFs will continue to function as normal. For more information, see the blog post .

SLICE_NUM Function

Returns an integer corresponding to the slice number in the cluster where the data for a row is located. SLICE_NUM takes no parameters.

Syntax

SLICE_NUM()

Return type

The SLICE_NUM function returns an integer.

Examples

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)