Not finding the correct syntax for the select statement

Hello

The following statement works very well and gives the expected results:

prompt
prompt Using WITH t
prompt

with t as
  (
   select a.proj_id,
          a.proj_start,
          a.proj_end,
          case when (
                     select min(a.proj_start)
                       from v b
                      where (a.proj_start  = b.proj_end)
                        and (a.proj_id    != b.proj_id)
                    )
                    is not null then 0 else 1
          end as flag
     from v a
    order by a.proj_start
  )
select proj_id,
       proj_start,
       proj_end,
       flag,
       --
       -- the following select statement is what I am having a hard time
       -- "duplicating" without using the WITH clause
       --
       (
        select sum(t2.flag)
          from t t2
         where t2.proj_end <= t.proj_end
       ) s
  from t;

As an academic exercise, I wanted to rewrite the above statement without using the WITH clause, I tried this (amongst dozens of other tests - I hit a mental block and cannot understand):

prompt
prompt without with
prompt

select c.proj_id,
       c.proj_start,
       c.proj_end,
       c.flag,
       --
       -- This is what I've tried as the equivalent statement but, it is
       -- syntactically incorrect.  What's the correct syntax for what this
       -- statement is intended ?
       --
       (
        select sum(t2.flag)
          from c t2
         where t2.proj_end <= c.proj_end
       ) as proj_grp
  from (
        select a.proj_id,
               a.proj_start,
               a.proj_end,
               case when (
                          select min(a.proj_start)
                            from v b
                           where (a.proj_start  = b.proj_end)
                             and (a.proj_id    != b.proj_id)
                         )
                         is not null then 0 else 1
               end as flag
          from v a
         order by a.proj_start
       ) c;

Thanks for the help, much appreciated.

John.

PS: The DDL for table v used by the above statements is:

drop table v;

create table v (
proj_id         number,
proj_start      date,
proj_end        date
);

insert into v values
       ( 1, to_date('01-JAN-2005', 'dd-mon-yyyy'),
            to_date('02-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 2, to_date('02-JAN-2005', 'dd-mon-yyyy'),
            to_date('03-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 3, to_date('03-JAN-2005', 'dd-mon-yyyy'),
            to_date('04-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 4, to_date('04-JAN-2005', 'dd-mon-yyyy'),
            to_date('05-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 5, to_date('06-JAN-2005', 'dd-mon-yyyy'),
            to_date('07-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 6, to_date('16-JAN-2005', 'dd-mon-yyyy'),
            to_date('17-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 7, to_date('17-JAN-2005', 'dd-mon-yyyy'),
            to_date('18-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 8, to_date('18-JAN-2005', 'dd-mon-yyyy'),
            to_date('19-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       ( 9, to_date('19-JAN-2005', 'dd-mon-yyyy'),
            to_date('20-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       (10, to_date('21-JAN-2005', 'dd-mon-yyyy'),
            to_date('22-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       (11, to_date('26-JAN-2005', 'dd-mon-yyyy'),
            to_date('27-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       (12, to_date('27-JAN-2005', 'dd-mon-yyyy'),
            to_date('28-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       (13, to_date('28-JAN-2005', 'dd-mon-yyyy'),
            to_date('29-JAN-2005', 'dd-mon-yyyy'));
insert into v values
       (14, to_date('29-JAN-2005', 'dd-mon-yyyy'),
            to_date('30-JAN-2005', 'dd-mon-yyyy'));

select c.proj_id,
       c.proj_start,
       c.proj_end,
       c.flag,
       --
       -- This is what I've tried as the equivalent statement but, it is
       -- syntactically incorrect.  What's the correct syntax for what this
       -- statement is intended ?
       --
       (
        select sum(t2.flag)
          from (select a.proj_id,
                       a.proj_start,
                       a.proj_end,
                       case when (
                          select min(a.proj_start)
                            from v b
                           where (a.proj_start  = b.proj_end)
                             and (a.proj_id    != b.proj_id)
                                 )  is not null then 0 else 1
                       end as flag
                  from v a
                 order by a.proj_start
               ) t2
         where t2.proj_end <= c.proj_end
       ) as proj_grp
  from (
        select a.proj_id,
               a.proj_start,
               a.proj_end,
               case when (
                          select min(a.proj_start)
                            from v b
                           where (a.proj_start  = b.proj_end)
                             and (a.proj_id    != b.proj_id)
                         )
                         is not null then 0 else 1
               end as flag
          from v a
         order by a.proj_start
       ) c;

Tags: Database

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