sql - 在 SQL Server 2005 中查找表中缺失的数字

Question

我将 int 数据类型列为否，并希望找到表中缺少的那些编号。

例如：1,2,3,7,8,9

答案 = 4,5,6

提前致谢。

Answer 1

就在普通的sql中：

SELECT a.id+1 AS start, MIN(b.id) - 1 AS end
FROM sequence AS a, sequence AS b
WHERE a.id < b.id
GROUP BY a.id
HAVING start < MIN(b.id)

你可以在Sqlfiddle上试试

Answer 2

尝试关注 -

DECLARE @TABLE TABLE (NUM INT)

INSERT INTO @TABLE
VALUES
 (1)
,(2)
,(3)
,(7)
,(8)
,(9)

DECLARE @MIN INT
DECLARE @MAX INT

SELECT @MIN = MIN(NUM) + 1, @MAX = MAX(NUM) - 1 FROM @TABLE

CREATE TABLE #TMP (FIELD_NO INT)
WHILE @MIN <= @MAX
BEGIN
   IF NOT EXISTS (SELECT * FROM @TABLE WHERE NUM = @MIN)
      INSERT INTO #TMP (FIELD_NO) VALUES (@MIN)
   SET @MIN = @MIN + 1
END

SELECT * FROM #TMP

DROP TABLE #TMP

Answer 3

您可以使用数字表

在这里，我使用master..spt_values具有范围的0-2047. 您可以将其替换为您自己的具有足够值的数字表。

declare @T table
(
  Number int
);

insert into @T values (1),(2),(3),(7),(8),(9);

with MinMax as
(
  select min(Number) as MinNumber,
         max(Number) as MaxNumber
  from @T
),
Number as
(
  select N.Number
  from master..spt_values as N
    inner join MinMax as MM
      on N.number between MM.MinNumber and MM.MaxNumber
  where N.type = 'P' 
)
select Number
from Number as N
where not exists
  (
    select *
    from @T as T
    where T.Number = N.number
  )
order by N.number