Add: Query data with dlt normalized column names

Closes #224

Author: github-actions[bot]

_questions/data-engineering-zoomcamp/workshop-1-dlthub/018_9950018686_dlt-column-names-snake-case.md

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+---
+id: '9950018686'
+question: How to query data when dlt normalizes column names to lowercase and snake_case?
+sort_order: 18
+---
+
+DLT normalizes column names to lowercase and converts them to snake_case. For example, Trip_Pickup_DateTime becomes trip_pickup_date_time. When querying, use the normalized column names.
+
+To discover the actual column names in a table, inspect the schema:
+
+```sql
+SELECT column_name
+FROM information_schema.columns
+WHERE table_schema = 'taxi_data'
+```
+
+Then use the normalized names in your queries, e.g.:
+
+```sql
+SELECT trip_pickup_date_time
+FROM taxi_data.trips;
+```
+
+Notes:
+- If you try to reference the original mixed-case column name (e.g., Trip_Pickup_DateTime) you may receive a "Referenced column not found" error because DLT has renamed the column.
+- Ensure you are querying the correct schema and table. The information_schema query above can help confirm the exact column names.
+
+If you need to work with a column that has a non-normalized name, you can still enclose the column in double quotes, but with DLT's normalization you typically should use the lowercase snake_case name.