试着这样做：
首先，我使用声明的表变量作为测试场景的**模型。
cte将在连字符处剪切数字。然后分别对这两部分使用数字排序。

DECLARE @tbl TABLE(StringNumber VARCHAR(10));
INSERT INTO @tbl VALUES
 ('1-1')
,('1-2')
,('1-11')
,('1-12')
,('1-21');

WITH Parted AS
(
    SELECT LEFT(StringNumber,pos.Hyph-1) AS PartOne
          ,SUBSTRING(StringNumber,pos.Hyph+1,1000) AS PartTwo
          ,StringNumber
    FROM @tbl AS tbl
    CROSS APPLY(SELECT CHARINDEX('-',StringNumber) ) AS Pos(Hyph)
)
SELECT * FROM Parted
ORDER BY CAST(PartOne AS INT),CAST(PartTwo AS INT)