Question

我在以下代码中不断遇到主键违规。如果我将主键放在Times表中，那么所有内容都按预期填充，但我必须有一个主键。在我的CASE声明中，我尝试删除了sale_day字段，但之后因在主键中插入NULL而收到了违规行为。在我的游标中，您将看到对Sales表的引用，该表包含填充sale_date表中sale_day字段的Times字段。我迷失了如何继续。

 SQL> CREATE TABLE Times (
  2  sale_day DATE NOT NULL,
  3  day_type VARCHAR2(50) NOT NULL,
  4  PRIMARY KEY (sale_day));

Table created.

SQL>
SQL>
SQL> CREATE OR REPLACE PROCEDURE Time_Procedure
  2  AS
  3  l_sale_date date;
  4  temp_value varchar2(5);
  5  CURSOR c1 IS SELECT SALE_DATE FROM SALES;
  6
  7  BEGIN
  8  OPEN c1;
  9  LOOP
 10  FETCH c1 INTO l_sale_date;
 11  EXIT WHEN c1%NOTFOUND;
 12  SELECT to_char(to_date(l_sale_date), 'DY') into temp_value from dual;
 13  CASE
 14  WHEN l_sale_date LIKE '%-JAN-01' OR l_sale_date LIKE '%-JAN-21' OR l_sale_date LIKE '%-FEB-18' OR l_sale_date LIKE '%-MAY-28'
 15  OR l_sale_date LIKE '%-JUL-04' OR l_sale_date LIKE '%-SEP-03' OR l_sale_date LIKE '%-OCT-08' OR l_sale_date LIKE '%-NOV-11'
 16  OR l_sale_date LIKE '%-NOV-22' OR l_sale_date LIKE '%-DEC-25'  THEN
 17  INSERT INTO Times values(l_sale_date,'Holiday');
 18  WHEN temp_value='MON' OR temp_value ='TUE' OR temp_value='WED' OR temp_value='THU' OR temp_value='FRI' THEN
 19  INSERT INTO Times values (l_sale_date,'Weekday');
 20  ELSE
 21  INSERT INTO Times values (l_sale_date, 'Weekend');
 22  END CASE;
 23  END LOOP;
 24  CLOSE c1;
 25  END;
 26  /

Procedure created.

SQL>
SQL> /* Populate table*/
SQL>
SQL> BEGIN
  2  Time_Procedure;
  3  END;
  4  /
BEGIN
*
ERROR at line 1:
ORA-00001: unique constraint (SDEV350USER.SYS_C0013043) violated
ORA-06512: at "SDEV350USER.TIME_PROCEDURE", line 19
ORA-06512: at line 2

Answer 1

SALES似乎不是唯一日期的来源。也许它包含有时间元素的日子？如果是这样，可能截断日期（删除时间元素）并应用DISTINCT将解决问题。

PL / SQL不需要填充TIMES，因为我们可以在SQL中使用CASE。

insert into times
select sale_date
       , case
           when to_char(sale_date, 'MON-DD') in ('JAN-01','JAN-21','FEB-18','MAY-28'
                       ,'JUL-04','SEP-03','OCT-08','NOV-11','NOV-22','DEC-25') then
                'Holiday'        
           when to_char(sale_date, 'DY') in ('MON','TUE','WED','THU','FRI') then
                'Weekday'
           else
                'Weekend'
         end as day_type  
from (select distinct trunc(sale_date) as sale_date 
      from sales)

PL / SQL主键冲突

1 个答案: