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Which columns can be included in an external table schema? (Select THREE).
Correct Answer: A,D,E
External tables in Snowflake expose a combination of user-defined columns and system-generated metadata columns. The VALUE column is commonly used to store semi-structured data (such as JSON or Avro records) read directly from external storage (Answer A). Snowflake also provides metadata columns that describe the source file. METADATA$FILENAME identifies the name of the file from which a given row was read (Answer D), and METADATA$FILE_ROW_NUMBER indicates the row number within that file (Answer E). These columns are frequently used for auditing, debugging, and data lineage tracking. METADATA$ROW_ID and METADATA$ISUPDATE are associated with streams and change tracking, not external tables. METADATA$EXTERNAL_TABLE_PARTITION is not a valid selectable column in the external table schema definition. This question reinforces SnowPro Architect knowledge of how Snowflake represents external data and exposes file-level metadata for data lake architectures. =========