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sql - 如果满足条件，SQL 返回特定值

问题描述

我有两张桌子：

CREATE TABLE dates 
(
  dates DATETIME
);
INSERT INTO dates(dates)
VALUES
('2021-04-22 00:00:00.000'),
('2021-04-23 00:00:00.000'),
('2021-04-24 00:00:00.000')

CREATE TABLE deliveries 
(
  delivery_id VARCHAR(20),
  product VARCHAR(10),
  start_date DATETIME,
  end_date DATETIME,
);
INSERT INTO deliveries(delivery_id, product, start_date, end_date)
VALUES
('A01', 'CUSTOM', '2021-04-22', '2021-04-23'),
('A02', 'CUSTOM', '2021-04-21', '2021-04-22'),
('A03', 'NORMAL', '2021-04-01', '2021-04-30'),
('A04', 'NORMAL', '2021-04-22', '2021-04-24'),
('A05', 'NORMAL', '2021-04-19', '2021-04-22'),
('A06', 'NORMAL', '2021-04-20', '2021-04-20')

这是我的查询：

declare @TodaysDate    datetime = CONVERT(DATETIME, CONVERT(DATE, CURRENT_TIMESTAMP)) + '00:00:00.000'
declare @EndDate      datetime = dateadd(day,5,@TodaysDate)
declare @TomorrowsDate      datetime = dateadd(day,1,@TodaysDate)

select dt.dates, de.delivery_id, de.product 

from dates dt left join deliveries de
on dt.dates between de.start_date and de.end_date

and not(de.end_date = @TodaysDate AND de.product LIKE '%CUSTOM%')

order by delivery_id

结果如下：

dates                   delivery_id   product
2021-04-22T00:00:00Z    A01           CUSTOM
2021-04-23T00:00:00Z    A01           CUSTOM
2021-04-23T00:00:00Z    A03           NORMAL
2021-04-24T00:00:00Z    A03           NORMAL
2021-04-22T00:00:00Z    A03           NORMAL
2021-04-22T00:00:00Z    A04           NORMAL
2021-04-24T00:00:00Z    A04           NORMAL
2021-04-23T00:00:00Z    A04           NORMAL
2021-04-22T00:00:00Z    A05           NORMAL

我需要修改此查询以再添加一个条件，以仅在产品现在和现在（2021-04-22）和明天（2021-04-23）时返回列中包含end_date（但不是start_date）的行。因此在上述情况下，结果不应包含行，而是从第 2 行开始：datesCUSTOMstart_dateend_date2021-04-22 | A012021-04-23 | A01

标签： sqlsql-server-2008-r2

解决方案

尝试将您的查询修改为此，看看它是否为您提供了正确的数据：

select 
    dt.dates, 
    de.delivery_id, de.product 
from dates dt 
left join deliveries de on dt.dates between de.start_date and de.end_date
and not(de.end_date = @TodaysDate AND de.product LIKE '%CUSTOM%')
and not(de.product LIKE '%CUSTOM%' AND dt.dates = @TodaysDate AND de.end_date = @TomorrowsDate)
order by de.delivery_id

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