通过在 Oracle Apex 中创建视图将列转换为 oracle 中的行

Question

我正在 Oracle Apex 中创建轮班表，我创建了一个表单来输入详细信息并将其保存在 table 中，table 数据如下所示。

我想在顶点页面显示如下数据。

如何传输数据？我正在尝试创建一个动态视图，尝试了不同的制作方法但没有成功，请提出建议。

Answer 1

我相信你需要 unpivot。查看此博客 post:

https://blogs.oracle.com/sql/how-to-convert-rows-to-columns-and-back-again-with-sql-aka-pivot-and-unpivot

还有这个：http://www.grassroots-oracle.com/2014/08/demystifying-oracle-unpivot.html

Answer 2

您不需要动态视图...一个月总是在 28 到 31 天之间，因此您可以创建一个包含 32 列（员工 + 31 天）的视图。每天创建一个包含案例陈述的列，以确定该员工是否有班次。这里以一个月的5天和最后4天为例（剩下的天数可以随便填写）：

WITH 
FUNCTION is_valid_date (date_str_i VARCHAR2, format_i VARCHAR2) RETURN VARCHAR2
/* check if date is valid */
AS
  l_dummy_dt DATE;
  date_not_valid_for_m EXCEPTION;
  PRAGMA EXCEPTION_INIT(date_not_valid_for_m, -01839);  
BEGIN
  SELECT TO_DATE(date_str_i,format_i) INTO l_dummy_dt FROM DUAL;
  RETURN 'Y';
EXCEPTION WHEN date_not_valid_for_m THEN
  RETURN 'N';
END; 
mymonth(monthname,yr) AS (SELECT 'FEB','2020' FROM dual)
,mydata (employee, shift, the_from, the_to) AS
(SELECT 'Deepa', 'A',TO_DATE('02-FEB-2020','DD-MON-YYYY'),TO_DATE('31-MAY-2020','DD-MON-YYYY') FROM DUAL
 UNION
 SELECT 'Srini', 'M',TO_DATE('02-FEB-2020','DD-MON-YYYY'),TO_DATE('04-MAY-2020','DD-MON-YYYY') FROM DUAL  
)
,myschedule (employee,day01,day02,day03,day04,day05,day28,day29,day30,day31)
AS
(
SELECT 
d.employee,
CASE WHEN TO_DATE('01-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END,
CASE WHEN TO_DATE('02-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END,
CASE WHEN TO_DATE('03-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END,
CASE WHEN TO_DATE('04-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END,
CASE WHEN TO_DATE('05-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END,
CASE WHEN TO_DATE('28-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END,
CASE WHEN is_valid_date(date_str_i => '29-'||m.monthname||'-'||m.yr,format_i => 'DD-MON-YYYY') = 'Y' 
  THEN
    CASE WHEN TO_DATE('29-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END
  ELSE 
    NULL
  END,
CASE WHEN is_valid_date(date_str_i => '30-'||m.monthname||'-'||m.yr,format_i => 'DD-MON-YYYY') = 'Y' 
  THEN
    CASE WHEN TO_DATE('30-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END
  ELSE 
    NULL
  END,
CASE WHEN is_valid_date(date_str_i => '31-'||m.monthname||'-'||m.yr,format_i => 'DD-MON-YYYY') = 'Y' 
  THEN
    CASE WHEN TO_DATE('31-'||m.monthname||'-'||m.yr,'DD-MON-YYYY') BETWEEN d.the_from AND d.the_to THEN d.shift ELSE NULL END
  ELSE 
    NULL
  END

FROM mydata d,mymonth m
)
SELECT * FROM myschedule;

现在您还有 1 个问题，那就是如何合并 Krish 和 Rahul 的行。您可以执行如下所示的操作：Oracle SQL: Merge rows into single row

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