**To string**: CAST(int_col AS STRING); SAFE_CAST for NULL on overflow. **To int**: CAST(str_col AS INT64); SAFE_CAST(str_col AS INT64). **SAFE_CAST**: Returns NULL on invalid input instead of error. **Example**: SELECT CAST(123 AS STRING), SAFE_CAST('abc' AS INT64) → NULL....
This easy-level SQL 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 (bigquery) 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.
To string: CAST(int_col AS STRING); SAFE_CAST for NULL on overflow. To int: CAST(str_col AS INT64); SAFE_CAST(str_col AS INT64). SAFE_CAST: Returns NULL on invalid input instead of error. Example: SELECT CAST(123 AS STRING), SAFE_CAST('abc' AS INT64) → NULL. Validate: Check for conversion failures in dirty data.
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Analyze My Answer — FreeAccording to DataEngPrep.tech, this is one of the most frequently asked SQL 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.