@kapa.ai i am not able to select cursor in postgres where update_at is null. since update_At can be null if it hasn’t been updated

It seems like you're facing an issue with selecting a cursor in Postgres where the

updated_at

field can be null. This can be problematic because null values can interfere with the incremental synchronization process. To handle this, you can use the

COALESCE

function in SQL, which allows you to substitute a null value with another value. For example, you can use the current timestamp or a default timestamp when

updated_at

is null. Here is an example of how you can modify your SQL query to handle null values in the

updated_at

field:

sql SELECT     id,     name,     COALESCE(updated_at, '1970-01-01 00:00:00') as updated_at FROM     table_one WHERE     COALESCE(updated_at, '1970-01-01 00:00:00') >= 'your_cursor_value';

In this example, if

updated_at

is null, it will be replaced with

'1970-01-01 00:00:00'

. You can replace

'1970-01-01 00:00:00'

with any default value that makes sense for your use case. Additionally, if you are using Airbyte's incremental synchronization, you might want to ensure that your SQL models are correctly handling null values. Here is an example from the knowledge sources that shows how to cast columns and handle null values:

sql select     cast("id" as bigint) as "id",     cast("name" as text) as "name",     cast(nullif(updated_at, '') as timestamp) as updated_at,     _airbyte_ab_id,     _airbyte_emitted_at,     now() as _airbyte_normalized_at from __dbt__cte__table_one_ab1 where 1 = 1

In this example, the

nullif

function is used to handle empty strings, which can be adapted to handle null values as well. For more detailed information, you can refer to the [Airbyte tutorial on incremental data synchronization](https://airbyte.com/tutorials/incremental-data-synchronization#step-6). If you continue to face issues, please provide more details about your specific setup and the exact error messages you are encountering.