ALTER TABLE .. ADD COLUMN IF NOT EXISTS

alterTable("t").addIfNotExists("c", INTEGER)

ALTER TABLE t ADD IF NOT EXISTS c int

ALTER TABLE t ADD COLUMN IF NOT EXISTS c int64

ALTER TABLE t ADD COLUMN IF NOT EXISTS c Nullable(integer)

ALTER TABLE t ADD IF NOT EXISTS c int4

ALTER TABLE t ADD COLUMN IF NOT EXISTS (c int)

BEGIN
  DECLARE CONTINUE HANDLER FOR SQLSTATE '42711' BEGIN END;
  EXECUTE IMMEDIATE '
    ALTER TABLE t ADD c integer
  ';
END

EXECUTE BLOCK
AS
BEGIN
  EXECUTE STATEMENT '
    ALTER TABLE t ADD c integer
  ';
  WHEN sqlcode -607 DO
    BEGIN END
END

DO BEGIN
  DECLARE EXIT HANDLER FOR SQL_ERROR_CODE 308 BEGIN END;
  EXECUTE IMMEDIATE '
    ALTER TABLE t ADD (c integer)
  ';
END;

BEGIN
  EXECUTE IMMEDIATE '
    ALTER TABLE t ADD c number(10)
  ';
EXCEPTION
  WHEN others THEN
    IF sqlerrm LIKE 'ORA-01430%' THEN NULL;
    ELSE RAISE;
    END IF;
END;

BEGIN TRY
  EXEC sp_executesql N'
    ALTER TABLE t ADD c int
  ';
END TRY
BEGIN CATCH
  IF error_number() NOT IN (2705) BEGIN
    DECLARE @ErrorMessage NVARCHAR(4000) = ERROR_MESSAGE();
    DECLARE @ErrorSeverity INT = ERROR_SEVERITY();
    DECLARE @ErrorState INT = ERROR_STATE();
    RAISERROR (@ErrorMessage, @ErrorSeverity, @ErrorState);
  END;
END CATCH

BEGIN TRY
  EXEC sp_executesql N'
    ALTER TABLE t ADD c int
  ';
END TRY
BEGIN CATCH
  IF error_number() NOT IN (2705) THROW;
END CATCH

ALTER TABLE t ADD IF NOT EXISTS c integer

ALTER TABLE t ADD COLUMN IF NOT EXISTS c int

/* UNSUPPORTED */

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