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Error Handling in T-SQL - TRY...CATCH, THROW, RAISEERROR

SQLeasy0.4 min readPremium

**Architectural Logic**: Error handling affects debuggability and caller experience. **TRY-CATCH**: Captures errors in block; enables cleanup or logging. **THROW** (SQL 2012+): Raises error; preserves call stack; use in CATCH to rethrow. **RAISERROR**: Legacy; custom messages;...

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Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Kaseya
Key Concepts Tested
sql

Why This Question Matters

This easy-level SQL question appears frequently in data engineering interviews at companies like Kaseya. While less common, it tests deeper understanding that distinguishes strong candidates. Mastering the underlying concepts (sql) will help you answer variations of this question confidently.

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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.

Expert Answer
83 words

Architectural Logic: Error handling affects debuggability and caller experience. TRY-CATCH: Captures errors in block; enables cleanup or logging. THROW (SQL 2012+): Raises error; preserves call stack; use in CATCH to rethrow. RAISERROR: Legacy; custom messages; doesn't preserve stack. Example: BEGIN TRY; INSERT ...; END TRY BEGIN CATCH; THROW; END CATCH. Why THROW: Better diagnostics; RAISERROR is deprecated for new code. Best Practice: Prefer THROW; use TRY-CATCH in procedures; log to error table; don't swallow without logging. Severity levels; avoid exposing internals to callers.

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