iLeschikov

CROSS/OUTER APPLY позволяет впихнуть в запрос табличную функцию
к примеру есть функция, разбора строки на части:

CREATE FUNCTION dbo.f_GTDparse (
  @id  INT,
  @gtd VARCHAR(100)
)
RETURNS @data_out TABLE (
  id               INT,
  CustomsCode      VARCHAR(25),
  RegistrationDate VARCHAR(25),
  GTDNumber        VARCHAR(25),
  GoodsNumeric     VARCHAR(25)
) AS
BEGIN

DECLARE @data TABLE (
  id          INT,
  [Selection] VARCHAR(100) NULL
)

INSERT INTO @data (id)
VALUES (@id)
;
WITH Data_RowNumber
AS (
  SELECT id,
         split.value,
         ROW_NUMBER() OVER (PARTITION BY id ORDER BY id) AS RowNumber
    FROM @data
    CROSS APPLY STRING_SPLIT(TRIM(@gtd), '/') AS split
)

INSERT INTO @data_out 
SELECT id,
       [1] AS CustomsCode,
       [2] AS RegistrationDate,
       [3] AS GTDNumber,
       ISNULL([4], '0') AS GoodsNumeric
  FROM Data_RowNumber
  PIVOT (
  MAX([value])
  FOR [RowNumber] IN ([1], [2], [3], [4])
  ) AS p

RETURN
END
GO

И теперь, чтобы вызвать ее в запросе используем

SELECT t.*, f.* FROM table t
OUTER APPLY dbo.f_GTDparse(t.Id, t.[ГТД]) f