Как отформатировать XML в SQL Server

Была такая же проблема, просто написал свою функцию:

CREATE FUNCTION LocalCustom.Pretty_XML(@uglyXML VARCHAR(MAX))
RETURNS VARCHAR(MAX) 
AS
BEGIN
  DECLARE @len AS INT = LEN(@uglyXML)
        , @prettyXML AS VARCHAR(MAX) = ''
        , @indent AS INT = 0
        , @tab AS CHAR(1) = CHAR(9)
        , @lf AS CHAR(1) = CHAR(10)
        , @currElement AS VARCHAR(MAX) = NULL
        , @nextElement AS VARCHAR(MAX);

  WHILE @uglyXML + ISNULL(@currElement,'') <> ''
  BEGIN
     IF @currElement IS NULL
     BEGIN
        SET @currElement = LocalCustom.GetColumn(1,'>',@uglyXML);
        SET @uglyXML = SUBSTRING(@uglyXML,LEN(@currElement)+2,@len);
     END;
     SET @nextElement = LocalCustom.GetColumn(1,'>',@uglyXML);
     IF @currElement LIKE '</%'
     BEGIN
        SET @indent = @indent - 1;
        SET @prettyXML = @prettyXML + REPLICATE(@tab,@indent) +  @currElement + '>' + CASE @indent WHEN 0 THEN '' ELSE @lf END;
        SET @currElement = @nextElement;
        SET @uglyXML = SUBSTRING(@uglyXML,LEN(@nextElement)+2,@len);
     END
     ELSE
        IF @currElement LIKE '<% /'
        BEGIN
           SET @prettyXML = @prettyXML + REPLICATE(@tab,@indent) +  @currElement + '>' + CASE @indent WHEN 0 THEN '' ELSE @lf END;
           SET @currElement = @nextElement;
           SET @uglyXML = SUBSTRING(@uglyXML,LEN(@nextElement)+2,@len);
        END
        ELSE
           IF @nextElement LIKE '%</' + SUBSTRING(@currElement,2,@len) 
           BEGIN
              SET @prettyXML = @prettyXML + REPLICATE(@tab,@indent) +  @currElement + '>' + @nextElement + '>' + @lf;
              SET @uglyXML = SUBSTRING(@uglyXML,LEN(@nextElement)+2,@len);
              SET @currElement = NULL;
           END
           ELSE
              IF @nextElement NOT LIKE '</%'
              BEGIN
                 SET @prettyXML = @prettyXML + REPLICATE(@tab,@indent) +  @currElement + '>' + @lf;
                 SET @indent = @indent + 1;
                 SET @currElement = @nextElement;
                 SET @uglyXML = SUBSTRING(@uglyXML,LEN(@nextElement)+2,@len);
              END;
  END;
  RETURN @prettyXML;
END
GO

Вышеупомянутая функция использует уже существующую:

CREATE FUNCTION [LocalCustom].[GetColumn]
(@ColumnNumber INT,
 @Delimiter VARCHAR(32),
 @Record VARCHAR(2000)) 
RETURNS VARCHAR(500)
AS
BEGIN
  DECLARE @ReturnValue VARCHAR(500)
  DECLARE @StartPosition INT
  DECLARE @EndPosition INT
  DECLARE @Counter INT
  -- Find position of first opening delimeter
  IF @ColumnNumber = 1
      SET @StartPosition = 1 - DATALENGTH(@Delimiter)
  ELSE
      BEGIN
      SET @StartPosition = 1
      SET @Counter = 1
      WHILE @StartPosition < LEN(@Record) AND @StartPosition <> 0 AND @Counter < @ColumnNumber 
          BEGIN
          SET @StartPosition = CHARINDEX(@Delimiter,@Record,@StartPosition+1)
          SET @Counter = @Counter + 1
          END
      IF @StartPosition = 0
          SET @StartPosition = LEN(@Record) + 1
      END
  -- Find position of closing delimeter
  SET @EndPosition = CHARINDEX(@Delimiter,@Record,@StartPosition+1)
  IF @EndPosition = 0
      SET @EndPosition = LEN(@Record) + 1
  -- If Valid start and end positions get column
  IF @EndPosition > @StartPosition AND @EndPosition <= LEN(@Record) + 1
      IF @EndPosition - @StartPosition - 1 = 0
          SET @ReturnValue = ''
      ELSE
          SET @ReturnValue = SUBSTRING(@Record, @StartPosition + DATALENGTH(@Delimiter), @EndPosition - @StartPosition - DATALENGTH(@Delimiter))
  ELSE
      SET @ReturnValue = NULL
  -- Strip Carriage Return, Line Feed character
  IF @ReturnValue IS NOT NULL
      BEGIN
      SET @ReturnValue = REPLACE(@ReturnValue,CHAR(10),'')
      SET @ReturnValue = REPLACE(@ReturnValue,CHAR(13),'')
      END
  -- Remove double quotes if used as column delimiter
  IF LEFT(@ReturnValue,1) = '"' AND RIGHT(@ReturnValue,1) = '"'
     BEGIN
     SET @ReturnValue = SUBSTRING(@ReturnValue,2,LEN(@ReturnValue)-2)
     SET @ReturnValue = REPLACE(@ReturnValue,'""','"')
     END
  RETURN @ReturnValue
END
GO

Это непросто, но если вы ВСТАВИТЕ его с форматированием, sqlserver сохранит форматирование при его извлечении. Форматирование текста в SQL Server довольно сложно, поскольку доступные функции очень ограничены.