CAST: Error on failure (e.g., 'abc'→INT). SAFE_CAST: NULL on failure. Use SAFE_CAST for dirty data; CAST when failure should propagate. Example: SAFE_CAST(col AS DATE) in ETL. Handle NULLs downstream.
This easy-level General/Other question appears frequently in data engineering interviews at companies like Aarete. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (etl) will help you answer variations of this question confidently.
Start by clearly defining the core concept being asked about. Interviewers want to see that you understand the fundamentals before diving into implementation details. Structure your answer with a definition, then explain the practical application with a concise example.
CAST: Error on failure (e.g., 'abc'→INT). SAFE_CAST: NULL on failure. Use SAFE_CAST for dirty data; CAST when failure should propagate. Example: SAFE_CAST(col AS DATE) in ETL. Handle NULLs downstream.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked General/Other interview questions, reported at 1 company. DataEngPrep.tech maintains a curated database of 1,863+ real data engineering interview questions across 7 categories, verified by industry professionals.