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285. TRY_CONVERT Function

Learn how SQL Server safely attempts data type conversions using TRY_CONVERT.

📘 Lesson 285 of 728 ⏱ 10 min 🎯 Intermediate

TRY_CONVERT is a SQL Server function that attempts to convert an expression to a specified data type and returns NULL when the conversion fails.

Imported business data frequently contains invalid numeric or date values. TRY_CONVERT allows analysts to detect those records safely.

Convert imported text values into dates while allowing invalid values to become NULL.

SQL 
SELECT
    CustomerID,
    TRY_CONVERT(DATE, RegistrationDateText) AS RegistrationDate
FROM CustomerImport;

TRY_CONVERT is useful in SQL Server ETL, data validation, data-quality analysis, and reporting preparation.

  • TRY_CONVERT safely attempts conversion.
  • Invalid conversions return NULL.
  • It is a SQL Server-specific function.
  • It is useful for data-quality checks.
  • It can support ETL workflows.
What does TRY_CONVERT return when conversion fails?

It normally returns NULL instead of raising a conversion error.

Where is TRY_CONVERT useful?

It is useful when cleaning imported data that may contain invalid dates, numbers, or other inconsistent values.

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