如果满足条件，SQL 将返回特定值

如何解决如果满足条件，SQL 将返回特定值

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','2021-04-21','2021-04-22'),('A03','NORMAL','2021-04-01','2021-04-30'),('A04','2021-04-24'),('A05','2021-04-19',('A06','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添加另一个条件，以便仅在产品为 end_date 和 {start_date 列中的 dates {1}} 是今天 (2021-04-22) 而 CUSTOM 是明天 (2021-04-23)。所以在上面的例子中，结果不应该包括 start_date 行而是从第二行开始：end_date

解决方法

尝试将您的查询修改为此，看看它是否为您提供正确的数据：

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

,

只需在 where 子句中添加以下条件：

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

DB-小提琴：

 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','2021-04-21','2021-04-22'),('A03','NORMAL','2021-04-01','2021-04-30'),('A04','2021-04-24'),('A05','2021-04-19',('A06','2021-04-20','2021-04-20')
 GO

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.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 ( start_date = @TodaysDate and end_date =@TomorrowsDate AND de.product LIKE '%CUSTOM%'
 and dates=start_date)
 
 
 
 order by delivery_id

输出：

日期	delivery_id	产品
2021-04-23 00:00:00.000	A01	自定义
2021-04-23 00:00:00.000	A03	正常
2021-04-22 00:00:00.000	A03	正常
2021-04-24 00:00:00.000	A03	正常
2021-04-24 00:00:00.000	A04	正常
2021-04-22 00:00:00.000	A04	正常
2021-04-23 00:00:00.000	A04	正常
2021-04-22 00:00:00.000	A05	正常

dbhere