How to Convert All Uppercase Values to Proper Case in SQL Server?

SQL Server: Transforming Uppercase Data to Proper Case

Managing data imported entirely in uppercase within SQL Server can be cumbersome. This article provides a solution for efficiently converting such data to proper case.

The following function provides a robust method for this conversion:

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 @f = 1 
    BEGIN
     SET @o = @o + @c;
     SET @f = 0;
    END
    ELSE
    BEGIN
     SET @o = @o + LOWER(@c);
    END

    IF @c LIKE @w SET @f = 1;

    SET @i = @i + 1;
  END

  RETURN @o;
END;

This function iterates through the input string, identifying words separated by whitespace. It capitalizes the first letter of each word while preserving the case of subsequent letters.

Example Usage:

SELECT dbo.ToProperCase('ALL UPPER CASE and    SOME lower ÄÄ ÖÖ ÜÜ ÉÉ ØØ ĈĈ ÆÆ');
-- Result: All Upper Case and      Some lower Ää Öö Üü Éé Øø Cc Ææ

This script offers a streamlined approach to converting uppercase data to proper case, thereby improving data readability and consistency within your SQL Server database.

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