创建正确的过程

Question

我正在尝试编写一个简单的PL/SQL过程，但我不断收到错误，我不明白。有一些 语法失败，如果有人能帮助我，我将不胜感激。 我需要创建一个程序，允许我插入一个特定的人（varchar2）与两个日期（日期），他的合同期限。然而，他的合同不能在现有日期之间，因此不能重叠，同一个人可以有多个联系人，但只能在完全不同的时间段之间。 我知道我需要使用INTERSECT，这只是我很困惑如何在这里使用它，因为我只有一个表。我之前有两张桌子相交，我怎么在这里相交呢？我;米也不知道我是否可以有2如果发言 谢谢！

CREATE OR REPLACE PROCEDURE test1 
(name    VARCHAR2, 
startDate  DATE, 
endDate   DATE) 
AS 
overlap  NUMBER := 0; 
CURSOR cursor IS 
SELECT date_from, date_to FROM contractTable; 
BEGIN 
    FOR row IN cursor LOOP 
    /*check if there is an overlap between dates*/ 
    IF (startDate, endDate) INTERESECT (SELECT date_from, date_to FROM ContractTable) THEN 
    overlap := overlap + 1;  
    END IF; 
    /*if there isn't, then insert new contact for this person*/ 
    IF overlap <= 0 THEN 
    INSERT INTO ContractTable VALUES(name, startDate, endDate); 
    END IF; 
    END test1; 

Answer 1

CREATE PROCEDURE test1 (l_name IN VARCHAR2, l_start_date IN DATE, l_end_date IN DATE) 
IS 

    l_overlap_check NUMBER; 

BEGIN 

    SELECT count(*) INTO l_overlap_check 
     FROM contract 
    WHERE (l_start_date between start_date and end_date 
      OR 
      l_end_date between start_date and end_date) 
     AND l_name = name; 

    IF l_overlap_check = 0 THEN 
     INSERT INTO contract (name, start_date, end_date) 
         VALUES (l_name, l_start, l_end); 
    END IF; 

END; 

我没有Oracle环境中方便，但应该是你所需要的。