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/). 

# CHECKSUM function
<a name="r_CHECKSUM"></a>

Computes a checksum value for building a hash index. 

## Syntax
<a name="r_CHECKSUM-synopsis"></a>

```
CHECKSUM(expression)
```

## Argument
<a name="r_CHECKSUM-argument"></a>

 *expression*   
The input expression must be a VARCHAR, INTEGER, or DECIMAL data type. 

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

The CHECKSUM function returns an integer. 

## Example
<a name="r_CHECKSUM-example"></a>

The following example computes a checksum value for the COMMISSION column: 

```
select checksum(commission)
from sales
order by salesid
limit 10;

checksum
----------
10920
1140
5250
2625
2310
5910
11820
2955
8865
975
(10 rows)
```