例如我有以下行
'1982-01-10T00:00:00Z'
'1982-01-11T00:00:00Z'
'1982-01-14T00:00:00Z'
'1985-01-16T00:00:00Z'
'1985-01-17T00:00:00Z'
'1985-02-12T00:00:00Z'
'1987-01-11T00:00:00Z'
'1987-01-12T00:00:00Z'
'1987-01-13T00:00:00Z'
我只需要第一行,第一行和第二行之间的差异不超过 1 天,我也想获得具有这种差异的行数,对于这个示例,我想得到以下内容:
'1982-01-10T00:00:00Z', 2
'1985-01-16T00:00:00Z', 2
'1987-01-11T00:00:00Z', 3
有什么想法吗?
我尝试过查询,但结果错误:
SELECT utc_timestamp, utc_timestamp - LAG (utc_timestamp, 1, utc_timestamp) OVER (
ORDER BY utc_timestamp
) difference
FROM (
SELECT utc_timestamp, AVG(GB_temperature) as avgt
FROM weather_data
GROUP BY strftime('%Y-%m-%d', utc_timestamp)
HAVING avgt < -4
);
最佳答案
嗯,这看起来不错,但我相信它可以用更少的代码行完成......
select min(date_before), count(date_c)+1, month, year from
(select strftime('%d',date_c) - lag(strftime('%d',date_c)) over (order by date_c) diff
, strftime('%d',date_c) day
, lag(strftime('%d', date_c)) over (order by date_c) day_before
, strftime('%m', date_c) month
, lag(strftime('%m', date_c)) over (order by date_c) m_before
, strftime('%Y', date_c) year
, lag(strftime('%Y', date_c)) over (order by date_c) y_before
, date_c
, lag(date_c) over (order by date_c) date_before
from testTable
order by date_c)
where diff = 1
and month = m_before
and year = y_before
group by month, year;
这是DEMO
关于SQlite 仅选择它们之间具有已定义差异的行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59037471/