SUBSTRING in SQL Server - Examples & AI Generator

Working with string data in SQL Server often requires extracting specific parts of text—precisely where the SUBSTRING function shines. Memorizing its exact SQL Server syntax, however, can slow down even seasoned analysts and developers. AI2sql transforms natural-language descriptions into production-ready SUBSTRING queries—no manual coding required—saving you time and frustration. Get accurate, syntax-perfect results instantly, whether you're migrating across databases or building new reports.

SUBSTRING Syntax in SQL Server

How to Write SUBSTRING in SQL Server

The SUBSTRING function returns part of a string starting at a specified position. The SQL Server-specific syntax is:

SUBSTRING (expression, start, length)

• expression: The text string (column or literal) you want to work with.

• start: The starting position (1-based index).

• length: How many characters to return.

Note: Unlike some databases, SQL Server starts positions at 1, not 0.

SUBSTRING Examples You Can Generate Instantly

Business-Focused SQL Server SUBSTRING Examples

• Extract the first 3 letters of customer names:

  SELECT SUBSTRING(CustomerName, 1, 3) AS ShortName
  FROM Customers;

• Get the middle 4 digits from 10-digit phone numbers:

  SELECT SUBSTRING(PhoneNumber, 4, 4) AS MiddleDigits
  FROM Orders;

• Retrieve product codes (first 5 characters) from descriptions:

  SELECT SUBSTRING(ProductDescription, 1, 5) AS ProductCode
  FROM Products;

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SUBSTRING in SQL Server: FAQ

• Can I use SUBSTRING on numeric fields?
  Yes, but CAST or CONVERT the value to VARCHAR first.

• What happens if the length exceeds the string size?
  SQL Server returns characters up to the end of the string—no error is thrown.

• Is start position zero-based or one-based?
  Start positions in SQL Server are one-based (start at 1).

Conclusion

Mastering SUBSTRING SQL Server syntax empowers you to extract targeted data efficiently. But remembering every nuance slows you down—especially under deadline. AI2sql gives you instant generation, accuracy, and the flexibility to handle any scenario—no coding required. Ready to accelerate your workflow? Generate Your First Query Now in 10 seconds or less!