检查“系统"是否为“系统".介于SQL中的两个日期之间 [英] Checking if the "system" falls between two dates in SQL

问题描述

场景Scenarion DEMO001系统由某些用户从8月10日预订到11月8日.

The Scenarion is DEMO001 system is booked from 10-Aug to 11-Aug by some user.

START_DATE     END DATE    SYSTEM
2016-08-10     2016-08-11  DEMO001
2016-09-05     2016-09-08  DEMO001
2016-08-08     2016-08-11  DEMO013
2016-08-16     2016-08-18  DEMO017

如果这几天其他用户尝试预订此系统.我们必须检查并传递0或1.

If Other user tries to book this system between these days . We have to check and pass 0 or 1.

我将得到一个输入参数

1) start_date as 2016-08-08 and 2016-08-15.
2) 2016-09-06 and 2016-09-07
3) 2016-08-08 and 2016-08-09

我必须编写一个PLSQL/SQL代码以传递0，因为DEMO001介于这些开始数据和输入的结束日期之间，否则传递1.

I have to write a PLSQL/SQL code to pass 0 because DEMO001 is falling between these start data and end date of the input else pass 1.

请帮助.

推荐答案

Oracle安装程序:

CREATE TABLE table_name ( START_DATE, END_DATE, SYSTEM ) AS
SELECT DATE '2016-08-10', DATE '2016-08-11', 'DEMO001' FROM DUAL UNION ALL
SELECT DATE '2016-09-05', DATE '2016-09-08', 'DEMO001' FROM DUAL UNION ALL
SELECT DATE '2016-08-08', DATE '2016-08-11', 'DEMO013' FROM DUAL UNION ALL
SELECT DATE '2016-08-16', DATE '2016-08-18', 'DEMO017' FROM DUAL;

查询:

以绑定变量:start_date和:end_date作为输入:

With the bind variables :start_date and :end_date as the inputs:

SELECT system,
       MIN(
         CASE
         WHEN :end_date < start_date OR :start_date > end_date
         THEN 1
         ELSE 0
         END
       ) AS can_book
FROM   table_name
GROUP BY system;

输出:

对于输入:start_date = DATE '2016-08-08'和:end_date = DATE '2016-08-15':

SYSTEM    CAN_BOOK
------- ----------
DEMO001          0 
DEMO013          0 
DEMO017          1 

对于输入:start_date = DATE '2016-09-06'和:end_date = DATE '2016-09-07':

SYSTEM    CAN_BOOK
------- ----------
DEMO001          0 
DEMO013          1 
DEMO017          1 

对于输入:start_date = DATE '2016-08-08'和:end_date = DATE '2016-08-09':

SYSTEM    CAN_BOOK
------- ----------
DEMO001          1 
DEMO013          0 
DEMO017          1 

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