Sql 如何检测postgres中的列是否持续增加？

我有一个按“类别”和“编号”排序的表。我正在尝试检测数量没有增加的行。我尝试过这种方法：

WITH test AS (
    SELECT * FROM (
        VALUES
            ('A', 1),
            ('B', 2),
            ('C', 4),
            ('D', 3),
            ('F', 5),
            ('F', 6),
            ('G', 7),
            ('H', 9),
            ('H', 8)
    ) AS t(category, number)
),
test_with_previous as(
select t.*, 
  lag(number) over (order by category, number) as prev_number
  from test t
)
select *
from test_with_previous
where prev_number > number;

其中：

类别 数字 上一个号码 D 3. 4. 使用超前而不是滞后：

您可以向数据中添加一个行号以获得序列号，然后与下一条记录合并，并以不等于1的增量过滤所有记录，或者您也可以简单地调整过滤器以获得所需的任何内容

;WITH 
test AS (
    SELECT * FROM (
        VALUES
            ('A', 1),
            ('B', 2),
            ('C', 4),
            ('D', 3),
            ('F', 5),
            ('F', 6),
            ('G', 7),
            ('H', 9),
            ('H', 8)
    ) AS t(category, number)
),
test_idx as (
    select *, ROW_NUMBER() over (order by category, number) id
    from test
)
select t1.id, t2.id, t1.category c1, t2.category c2, t1.number n1, t2.number n2, t2.number - t1.number diff
from test_idx t1
left join test_idx t2 on t1.id = t2.id-1
where t1.number <> t2.number -1;

---

好的，D是第一行，数字减少。您是否正在查找与上一行不同的第一行？

;WITH 
test AS (
    SELECT * FROM (
        VALUES
            ('A', 1),
            ('B', 2),
            ('C', 4),
            ('D', 3),
            ('F', 5),
            ('F', 6),
            ('G', 7),
            ('H', 9),
            ('H', 8)
    ) AS t(category, number)
),
test_idx as (
    select *, ROW_NUMBER() over (order by category, number) id
    from test
)
select t1.id, t2.id, t1.category c1, t2.category c2, t1.number n1, t2.number n2, t2.number - t1.number diff
from test_idx t1
left join test_idx t2 on t1.id = t2.id-1
where t1.number <> t2.number -1;

id  id  c1  c2  n1  n2  diff
2   3   B   C   2   4   2
3   4   C   D   4   3   -1
4   5   D   F   3   5   2