小编use*_*214的帖子

SELECT MIN(col1) AS start_range, MAX(col1) AS end_range 
FROM (SELECT col1, 
        (
        SELECT MIN(B.col1) 
         FROM dbo.T1 AS B 
         WHERE B.col1 >= A.col1 
           AND NOT EXISTS 
             (SELECT * 
              FROM dbo.T1 AS C 
              WHERE C.col1 = B.col1 + 1)
        ) AS grp
      FROM dbo.T1 AS A) AS jh 
GROUP BY grp;

如果我删除"AS jh",为什么会出错？为什么我需要相同的"AS grp".(不一样,因为我分组)但我不能删除它.在第二个代码中没有这样的"AS".

SELECT col1, 
  (SELECT MIN(B.col1) 
    FROM dbo.T1 AS B 
    WHERE B.col1 >= A.col1 
      -- is this row the last in its group? 
      AND NOT EXISTS 
        (SELECT * 
         FROM dbo.T1 AS …