Question

Я пишу SQL-запрос, чтобы получить строки между форматами диапазона дат: мм / дд / гггг

Я использовал оператор between, но результат отображается вне диапазона дат

Select Internship_StartDate1
From [Media_BPM].[dbo].[BP_UGME]
Where TrainingType = 'Medical Internship Training'
  and Internship_StartDate1 Between '01/%/2020%'  AND '06/%/2020%'
Order By Internship_StartDate1 desc

Ожидаемый результат: только даты 2020 года

Фактический результат:

Internship_StartDate1
05/16/2018
05/06/2018
05/05/2019
05/05/2019
05/02/2019
05/02/2019
05/02/2019
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forpas · Answer 1 · 03 ноября 2019

Я предполагаю, что вы используете SQL Server. Может быть, вы думаете, что % является символом подстановки в этом состоянии, обозначающим любой символ, но это не так. Вы можете использовать % с оператором LIKE, но не с BETWEEN. Используйте функцию FORMAT():

Select Internship_StartDate1 
from [Media_BPM].[dbo].[BP_UGME] 
where TrainingType = 'Medical Internship Training' 
AND FORMAT(Internship_StartDate1, 'yyyyMM') Between '202001' AND '202006' 
Order By Internship_StartDate1 desc

artyr · Answer 2 · 03 ноября 2019

Я просто хочу добавить, что я использовал YYYYMMDD в своем коде SQL, потому что это (кажется) всегда работает (ы) даже без форматирования, и, поверьте мне, у меня возникли проблемы с MDY (по умолчанию MS) и DMY (например германия) много. Итак, для всего 2020 года я бы искал вот так:

select Internship_StartDate1 
  from Media_BPM.dbo.BP_UGME
 where TrainingType = 'Medical Internship Training' and
       --  first and last time tick in 2020
       Internship_StartDate1 between '20200101' and '20201231 23:59:59.997'
 order by Internship_StartDate1 desc

Gordon Linoff · Answer 3 · 03 ноября 2019

Вы явно путаете LIKE групповые символы с другими сравнениями. '%' работает только с LIKE и NOT LIKE.

Что более важно, используйте сравнения дат по датам! Это очень важно для оптимизации. Вы должны написать свое условие как:

select Internship_StartDate1
from [Media_BPM].[dbo].[BP_UGME]
where TrainingType = 'Medical Internship Training' and
      Internship_StartDate1 >= '2020-01-01' and
      Internship_StartDate1 < '2020-07-01'
order by Internship_StartDate1 desc;

Нет необходимости преобразовывать даты в строку для таких сравнений. Прямые сравнения позволяют:

Преобразование дат в строки приводит к накладным расходам в каждой обрабатываемой строке.
Оптимизатор запросов для выбора соответствующих индексов, если они доступны.
Оптимизатор запросов для выбора соответствующих разделов, если он доступен.
Оптимизатор запросов для выбора соответствующих алгоритмов, поскольку статистика размеров, вероятно, будет более точной.

Inam Abbas · Answer 4 · 03 ноября 2019

просто установите формат даты и времени

 Select Internship_StartDate1 from [Media_BPM].[dbo].[BP_UGME]

WHERE TrainingType = 'Обучение по медицинским стажировкам' И ГОД (CONVERT (date, Internship_StartDate1,103)) МЕЖДУ '2019' И '2020' Order By Internship_StartDate1 desc

SQL в диапазоне дат возвращает неверный результат

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SQL в диапазоне дат возвращает неверный результат

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