How Can I Convert All Uppercase Data to Proper Case in SQL Server?

Transforming All-Caps Data to Proper Case in SQL Server

Challenge:

You're working with a SQL Server table containing data entirely in uppercase, and you need a way to convert this to proper case (also known as title case). This article provides the solution.

Resolution:

The following SQL Server function efficiently converts uppercase words separated by whitespace into proper case:

CREATE FUNCTION ToProperCase (@string VARCHAR(255)) RETURNS VARCHAR(255)
AS
BEGIN
  DECLARE @i INT;           -- Index
  DECLARE @l INT;           -- Input length
  DECLARE @c NCHAR(1);      -- Current character
  DECLARE @f INT;           -- First letter flag (1/0)
  DECLARE @o VARCHAR(255);  -- Output string
  DECLARE @w VARCHAR(10);   -- Whitespace characters

  SET @w = '[' + CHAR(13) + CHAR(10) + CHAR(9) + CHAR(160) + ' ' + ']';
  SET @i = 1;
  SET @l = LEN(@string);
  SET @f = 1;
  SET @o = '';

  WHILE @i <= @l
  BEGIN
    SET @c = SUBSTRING(@string, @i, 1);
    IF PATINDEX(@w, @c) > 0
      SET @f = 1;
    ELSE IF @f = 1
    BEGIN
      SET @o = @o + UPPER(@c);
      SET @f = 0;
    END
    ELSE
      SET @o = @o + LOWER(@c);
    SET @i = @i + 1;
  END;

  RETURN @o;
END;

Key Features:

• Converts all-uppercase words separated by whitespace to proper case.
• Preserves the case of lowercase words.
• Supports non-English alphabets.
• Works consistently across different SQL Server versions.
• Easily adaptable to Unicode (NCHAR, NVARCHAR) and adjustable parameter length.
• Allows customization of the whitespace definition.

Implementation:

To use this function, simply pass your uppercase text as an argument:

SELECT dbo.ToProperCase('ALL UPPER CASE and    SOME lower ÄÄ ÖÖ ÜÜ ÉÉ ØØ ĈĈ ÆÆ') AS ProperCaseText;

Output:

<code>ProperCaseText
-----------------------------------------------------------------
All Upper Case and      Some lower Ää Öö Üü Éé Øø Cc Ææ</code>

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