Oracle DB 创建时间维度

在数据仓库的创建过程中，往往需要创建日期维度来为以后的数据分析来服务。

方面从多个日期角度：

如：年-月-日，年-季度-月-日，年-周-日

(1) 创建表的脚本如下

（存储过程的创建过程中有一步操作是向time_dimension表中插入数据，所以首先需要创建好此表）

create table TIME_DIMENSION
(
  the_date     NUMBER not null,
  date_name    NVARCHAR2(15),
  the_year     NUMBER,
  year_name    NVARCHAR2(10),
  the_quarter  VARCHAR2(10),
  quarter_name NVARCHAR2(10),
  the_month    NUMBER,
  month_name   NVARCHAR2(10),
  the_week     NUMBER,
  week_name    NVARCHAR2(10),
  week_day     NVARCHAR2(10)
)
tablespace DEV1_ODI_USER
  pctfree 10
  initrans 1
  maxtrans 255
  storage
  (
    initial 64
    next 1
    minextents 1
    maxextents unlimited
  );

 (2) 存储过程脚本如下

create or replace PROCEDURE 
SP_CREATE_TIME_DIMENSION(begin_date in varchar2,end_date in varchar2) is
dDate date;
v_the_date number;
v_the_year varchar2(4);
v_the_quarter varchar2(2);
v_the_month varchar2(10);
v_the_month2 varchar2(2);
v_the_week varchar2(2);
v_the_day varchar2(10);
v_the_day2 varchar2(2);
v_week_day nvarchar2(10);

adddays int;
BEGIN
adddays := 1 ;
dDate := to_date(begin_date,'yyyymmdd');

WHILE (dDate <= to_date(end_date,'yyyymmdd'))
loop
   v_the_date := to_number(to_char(dDate,'yyyymmdd'));--key值
   v_the_year:= to_char(dDate, 'yyyy');--年
   v_the_quarter := to_char(dDate, 'q');--季度
   v_the_month:=to_char(dDate, 'mm');--月份(字符型)
   v_the_month2:=to_number(to_char(dDate, 'mm'));--月份(数字型)
   v_the_day:=to_char(dDate, 'dd');--日(字符型)
   v_the_day2:=to_char(dDate, 'dd');
   v_the_week:= to_char(dDate,'fmww');--年的第几周
   v_week_day := to_char(dDate, 'day'); --星期几


  insert into time_dimension(the_date,date_name,the_year,year_name,
                            the_quarter,quarter_name,the_month,
                            month_name,the_week,week_name,week_day)
                      values(v_the_date,v_the_year||'年'||v_the_month2||'月'||v_the_day2||'日',v_the_year,v_the_year||'年',
                            v_the_year||'Q'||v_the_quarter,v_the_year||'年'||v_the_quarter||'季度',to_number(v_the_year||v_the_month),
                            v_the_year||'年'||v_the_month2||'月',v_the_week,'第'||v_the_week||'周',
                            v_week_day);

   dDate :=  dDate + adddays;
END loop;
end SP_CREATE_TIME_DIMENSION;

 (3) 命令窗口的执行脚本如下

SQL> exec SP_CREATE_TIME_DIMENSION(20140101,20140630);
 
PL/SQL procedure successfully completed
 
SQL> commit;
 
Commit complete
 
SQL> select * from time_dimension;