SQL Server → PostgreSQL

TRY_CONVERT and Safe Type Conversion: SQL Server vs PostgreSQL

TRY_CAST/TRY_CONVERT avoid errors in T-SQL. In PostgreSQL use regex, CASE, or custom functions for tolerant conversion.

TRY_CAST returns NULL instead of error when conversion fails — essential in staging loads. PostgreSQL has no native TRY_CAST; validate with regex or wrap in PL/pgSQL with EXCEPTION.

Regex pattern (integers)

PostgreSQL

SELECT CASE
  WHEN code ~ '^[0-9]+$' THEN code::int
  ELSE NULL
END AS code_num
FROM staging_import;

Analisador de Impacto

ETL with tolerant conversion needs testing on dirty data. Validate the entire batch in the Impact Analyzer.

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