I am not so into SQL and I have to create a complex query. My idea is start to a simple query and enrich it step by step. I am using MySql
I ahve some doubts about a possible smart way for the first step.
So I have a MeteoForecast table like this:
CREATE TABLE MeteoForecast (
id BigInt(20) NOT NULL AUTO_INCREMENT,
localization_id BigInt(20) NOT NULL,
seasonal_forecast_id BigInt(20),
meteo_warning_id BigInt(20),
start_date DateTime NOT NULL,
end_date DateTime NOT NULL,
min_temp Float,
max_temp Float,
icon_link VarChar(255) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL,
PRIMARY KEY (
id
)
) ENGINE=InnoDB AUTO_INCREMENT=3 ROW_FORMAT=DYNAMIC DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci;
It contains data like this:
id localization_id start_date end_date min_temp max_temp icon_link
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
1 1 18/09/2017 06:00:00 18/09/2017 12:00:00 15 24 Mostly_Cloudy_Icon.png
2 1 18/09/2017 12:00:00 18/09/2017 18:00:00 15 24 Light_Rain.png
3 1 19/09/2017 06:00:00 19/09/2017 12:00:00 12 22 Mostly_Cloudy_Icon.png
4 1 19/09/2017 12:00:00 19/09/2017 18:00:00 13 16 Mostly_Cloudy_Icon.png
5 1 20/09/2017 06:00:00 20/09/2017 12:00:00 18 26 Light_Rain.png
6 1 20/09/2017 12:00:00 20/09/2017 18:00:00 17 25 Light_Rain.png
It represents meteo forecast and as you can see it have a starting datetime and and ending datetime. So, for a specific place (specified by the localization_id field) I can have more record for a same day (different hours range, in the example I created 2 range: from 06:00 to 12:00 and from 12:00 to 18:00).
I want retrieve all the records related 2 days from a starting date so I am trying to do something like this:
select * from MeteoForecast where
start_date between '18/09/2017 06:00:00' and '20/09/2017 06:00:00'
order by start_date desc;
But it give me back 0 records.
I also tried this:
select * from MeteoForecast where
start_date >= '18/09/2017 06:00:00' and
end_date < '20/09/2017 18:00:00'
order by start_date desc;
But still obtain the same problem
What could be the problem? What am I missing? How can I fix this issue?
Try this.
select * from MeteoForecast
where start_date between '2017-09-18 06:00:00' and '2017-09-20 06:00:00'
order by start_date desc;
Datetime in Mysql. Refer this doc.