基于历史表创建视图
我想基于具有历史表的数据库创建SQL视图.
哪个是最好的解决方案(快速有效).我没有创建应用程序,我无法更新数据库表.我只能创建视图.
以下是上下文:
我的申请管理合同.合同包含一般信息,并与联系人,法律参考和投资组合相关联.更新完成后,会在历史记录表(新ID_HIST)中添加新行.如果对联系人,法律参考或投资组合进行了更新,则会在表contract_HIST(具有相同的ID_HIST)中添加新行.
我的目的是创建一个视图来显示在行(ID HIST)上完成的更新与之前的ID HIST相比,如:
因此,对于每个新的更新(对于特定的日期,感谢ID HIST),我们可以看到一般信息,联系人,法律参考或/和投资组合是否已更新.
下面是数据库的结构:
在表格中,可以将一个或多个投资组合分配给同一更新的合同.
有关信息:例如,如果在新更新期间,已删除合同的联系人,则在contract_hist中为此合同添加新行(具有新ID_HIST)但未在表contact_hist中添加新行.法律参考和投资组合也是如此.
这里的视图应该显示:
这里是用于测试的数据库的脚本:
--------------------------------------------------------
-- DDL for Table CONTACT_HIST
--------------------------------------------------------
CREATE TABLE "CONTACT_HIST"
( "ID_HIST" NUMBER,
"ID_CONTRAT" NUMBER,
"NAME_CONTACT" VARCHAR2(20 BYTE)
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "RAM" ;
REM INSERTING into BO.CONTACT_HIST
SET DEFINE OFF;
Insert into BO.CONTACT_HIST (ID_HIST,ID_CONTRAT,NAME_CONTACT) values (1,1,'Bernard');
Insert into BO.CONTACT_HIST (ID_HIST,ID_CONTRAT,NAME_CONTACT) values (1,1,'Jean');
Insert into BO.CONTACT_HIST (ID_HIST,ID_CONTRAT,NAME_CONTACT) values (2,1,'Nicolas');
Insert into BO.CONTACT_HIST (ID_HIST,ID_CONTRAT,NAME_CONTACT) values (2,1,'Jean');
Insert into BO.CONTACT_HIST (ID_HIST,ID_CONTRAT,NAME_CONTACT) values (3,2,'Nicolas');
Insert into BO.CONTACT_HIST (ID_HIST,ID_CONTRAT,NAME_CONTACT) values (5,2,'Nicolas');
--------------------------------------------------------
-- DDL for Table CONTRAT_HIST
--------------------------------------------------------
CREATE TABLE "BO"."CONTRAT_HIST"
( "ID_HIST" NUMBER,
"DATE_CREATION" DATE,
"ID_CONTRAT" NUMBER,
"TITRE_CONTRAT" VARCHAR2(250 BYTE),
"DESCRIPTION" VARCHAR2(250 BYTE),
"BUDGET" NUMBER
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "RAM" ;
REM INSERTING into BO.CONTRAT_HIST
SET DEFINE OFF;
Insert into BO.CONTRAT_HIST (ID_HIST,DATE_CREATION,ID_CONTRAT,TITRE_CONTRAT,DESCRIPTION,BUDGET) values (1,to_date('01-JAN-15','DD-MON-RR'),1,'Contrat 1 ','Contrat Informatique ',20000);
Insert into BO.CONTRAT_HIST (ID_HIST,DATE_CREATION,ID_CONTRAT,TITRE_CONTRAT,DESCRIPTION,BUDGET) values (2,to_date('15-JAN-15','DD-MON-RR'),1,'Contrat 1 ','Contrat Informatique ',50000);
Insert into BO.CONTRAT_HIST (ID_HIST,DATE_CREATION,ID_CONTRAT,TITRE_CONTRAT,DESCRIPTION,BUDGET) values (3,to_date('02-FEB-15','DD-MON-RR'),2,'Contrat 2 ','Contrat Santé ',10000);
Insert into BO.CONTRAT_HIST (ID_HIST,DATE_CREATION,ID_CONTRAT,TITRE_CONTRAT,DESCRIPTION,BUDGET) values (4,to_date('01-MAR-15','DD-MON-RR'),2,'Contrat 2 ','Contrat Consommateur ',30000);
Insert into BO.CONTRAT_HIST (ID_HIST,DATE_CREATION,ID_CONTRAT,TITRE_CONTRAT,DESCRIPTION,BUDGET) values (5,to_date('01-JUL-15','DD-MON-RR'),1,'Contrat 1 ','Contrat Informatique ',50000);
--------------------------------------------------------
-- DDL for Index CONTRAT_HIST_PK
--------------------------------------------------------
CREATE UNIQUE INDEX "BO"."CONTRAT_HIST_PK" ON "BO"."CONTRAT_HIST" ("ID_HIST")
PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "RAM" ;
--------------------------------------------------------
-- Constraints for Table CONTRAT_HIST
--------------------------------------------------------
ALTER TABLE "BO"."CONTRAT_HIST" ADD CONSTRAINT "CONTRAT_HIST_PK" PRIMARY KEY ("ID_HIST")
USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "RAM" ENABLE;
ALTER TABLE "BO"."CONTRAT_HIST" MODIFY ("ID_HIST" NOT NULL ENABLE);
--------------------------------------------------------
-- DDL for Table LEGAL_REFERENCE_HIST
--------------------------------------------------------
CREATE TABLE "BO"."LEGAL_REFERENCE_HIST"
( "ID_HIST" NUMBER,
"ID_CONTRAT" NUMBER,
"LEG_REF_NAME" VARCHAR2(250 BYTE)
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "RAM" ;
REM INSERTING into BO.LEGAL_REFERENCE_HIST
SET DEFINE OFF;
Insert into BO.LEGAL_REFERENCE_HIST (ID_HIST,ID_CONTRAT,LEG_REF_NAME) values (1,1,'45 - Technologies et Systeme d''Information');
Insert into BO.LEGAL_REFERENCE_HIST (ID_HIST,ID_CONTRAT,LEG_REF_NAME) values (2,2,'105 - Consommateur et Santé');
Insert into BO.LEGAL_REFERENCE_HIST (ID_HIST,ID_CONTRAT,LEG_REF_NAME) values (5,1,'27 - Services');
--------------------------------------------------------
-- DDL for Table PORTFOLIO_HIST
--------------------------------------------------------
CREATE TABLE "BO"."PORTFOLIO_HIST"
( "ID_HIST" NUMBER,
"ID_CONTRAT" NUMBER,
"PORTFOLIO_ID" NUMBER,
"PORTFOLIO_NAME" VARCHAR2(250 BYTE),
"PORTFOLIO_VALUE" NUMBER
) SEGMENT CREATION IMMEDIATE
PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255
NOCOMPRESS LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1
BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT)
TABLESPACE "RAM" ;
REM INSERTING into BO.PORTFOLIO_HIST
SET DEFINE OFF;
Insert into BO.PORTFOLIO_HIST (ID_HIST,ID_CONTRAT,PORTFOLIO_ID,PORTFOLIO_NAME,PORTFOLIO_VALUE) values (2,1,1,'Portfolio 1',5000);
Insert into BO.PORTFOLIO_HIST (ID_HIST,ID_CONTRAT,PORTFOLIO_ID,PORTFOLIO_NAME,PORTFOLIO_VALUE) values (2,1,2,'Portfolio 2',7000);
Insert into BO.PORTFOLIO_HIST (ID_HIST,ID_CONTRAT,PORTFOLIO_ID,PORTFOLIO_NAME,PORTFOLIO_VALUE) values (4,2,1,'Portfolio 1',2000);
Insert into BO.PORTFOLIO_HIST (ID_HIST,ID_CONTRAT,PORTFOLIO_ID,PORTFOLIO_NAME,PORTFOLIO_VALUE) values (4,2,2,'Portfolio 2',8000);
commit;
开始了：
首先：创建一个存储函数（或包中的函数），如下所示：
create or replace function test_history(i_contract_id in number,
i_date_created in date,
i_type in varchar2)
return varchar2 is
l_sql varchar2(1000);
l_result number;
begin
l_sql := 'select 1 from test_history_tb where id_contract = :1 and date_creation = :2 and ' ||
i_type || ' = :3 and rownum = 1';
execute immediate l_sql
into l_result
using i_contract_id, i_date_created, 'update';
return('update');
exception
when no_data_found then
return('no_update');
end;
第二：根据函数创建查询：
create view xxx as
select id_contract, date_creation,
test_history(a.id_contract, a.date_creation, 'general_info') general_info,
test_history(a.id_contract, a.date_creation, 'contract') contract,
test_history(a.id_contract, a.date_creation, 'legal') legal,
test_history(a.id_contract, a.date_creation, 'portfolio') portfolio
from test_history_tb a
group by a.id_contract, a.date_creation;
这个解决方案不是那么快，因为对于每一行我们都有一个函数调用。但如果您使用 where 子句过滤数据，这将是一种替代方案。
表中的示例数据：
...这是视图上的查询的样子：
