我有一个有序列号的表。
我想找到缺失的序列号,这是缺少数字的最小值。
For eg.,
Seq No: 1,2,3,5,7,9 ==> Expected result: 4
Seq No: 1,2,3,4,5,6,7,9,15 ==> Expected result: 8
你可以试试row_number()
with cte as
(
select seq,seq-row_number() over(order by seq) as diff
from tablename
)
select * from cte where diff<>0 and diff in (select min(diff) from cte where diff<>0)
利用row_number()
生成一个新序列,并将其与原始序列进行比较
select min(new_seq)
from
(
select *, new_seq = row_number() over (order by seq)
from your_table
) t
where seq <> new_seq
选择序列号加1不存在的最小序列号,并添加一个:
select min(seqNo)+1 from SeqNoTable where seqNo+1 not in (select SeqNo from SeqNoTable)