editing a start date of information from another table

Hello all;

I have the sample data below
create table t1
(
       id varchar2(200),
       begin_date date,
       ending_date date
);
create table t2
(
   id varchar2(200),
   period_number number(30),
   period varchar2(200) 
);
insert into t1
  (id, begin_date, ending_date)
values
  ('A', sysdate, to_date('01/02/2020', 'MM/DD/YYYY'));
insert into t1
  (id, begin_date, ending_date)
values
  ('B', sysdate, to_date('03/31/2011', 'MM/DD/YYYY') );
insert into t1
  (id, begin_date, ending_date)
values
  ('C', sysdate, to_date('01/20/2011', 'MM/DD/YYYY')); 

insert into t2
  (id, period_number, period)
values
  ('A', 2, 'Years');
insert into t2
  (id, period_number, period)
values
  ('B', 3, 'Months');
insert into t2
  (id, period_number, period)
values
  ('C', 4, 'Days');
So what I'm trying to do is basically update the start date in t1, using the information from table t2
for example, A
start date should be start date = 01/02/2020-2 years = 01/02/2018
for C
start date should be start date = 20/01/2011 - 4 = 01/16/2011

Thanks for the sample data, it makes life easier.

Something like this:

SQL> UPDATE t1
  2  SET begin_date = (SELECT CASE WHEN t2.period = 'Years' THEN ADD_MONTHS(t1.ending_date, t2.period_number * -12)
  3                                WHEN t2.period = 'Months' THEN ADD_MONTHS(t1.ending_date, t2.period_number * -1)
  4                                ELSE t1.ending_date - t2.period_number END
  5                    FROM t2
  6                    WHERE t1.id = t2.id)
  7  WHERE EXISTS (SELECT 1 FROM t2
  8                WHERE t1.id = t2.id);

3 rows updated.

SQL> SELECT * FROM t1;

ID         BEGIN_DATE  ENDING_DATE
---------- ----------- -----------
A          02-JAN-2018 02-JAN-2020
B          31-DEC-2010 31-MAR-2011
C          16-JAN-2011 20-JAN-2011

If t2 is unique, you could also do it as an editable join view using a structure of similar cases.

John

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