[Solved] Identify the error in this incremental model SQL snippet:{{ config(materialized='incremental') }} select id, updated_at, data from source_table {% if is_incremental() %} where updated_at > (select... | dbt

dbt - Incremental Models

Identify the error in this incremental model SQL snippet:

{{ config(materialized='incremental') }}

select id, updated_at, data
from source_table

{% if is_incremental() %}
  where updated_at > (select max(updated_at) from source_table)
{% endif %}

AThe filter compares <code>updated_at</code> to max from <code>source_table</code> instead of the target table.

BThe <code>is_incremental()</code> block is missing an <code>else</code> clause.

CThe model should use <code>materialized='table'</code> instead of <code>incremental</code>.

DThe <code>select</code> statement is missing a <code>group by</code> clause.

Step-by-Step Solution

Solution:

Step 1: Check the incremental filter logic
The filter uses max(updated_at) from source_table, which is the source, not the target incremental table.
Step 2: Understand correct incremental filter
The filter should compare to max(updated_at) from the target table ({{ this }}) to avoid reloading all data.
Final Answer:
The filter compares updated_at to max from source_table instead of the target table. -> Option A
Quick Check:
Incremental filter must use target table max date [OK]

Quick Trick: Use target table max date in incremental filter [OK]

Common Mistakes:

MISTAKES

Using source table max date in incremental filter
Forgetting to use {{ this }} in subquery
Confusing incremental and full refresh logic

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Identify the error in this incremental model SQL snippet:

Step 1: Check the incremental filter logic

Step 2: Understand correct incremental filter

Final Answer:

Quick Check:

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