Set a variable to the result of an instruction select

I create a list view of the numbers that I have in the system. I'm doing a table with only a list of numbers from 1 to whatever number max is in view. IIf 89 324 is so the last number in the system, so I want a table with 1 thru 89324. Then I can use the NOT EXIST to determine what numbers are miissing in the system. so, if 1 to 200 are not used, but by 89 324 201 is used, then I want the output to 1,2,3... 200.

The code to make the display works and the code to create the table is good, the loop works when I use a number defined for example 100. I just have problems affecting a variable in the number max.

Here's what I have (which of course does not)

CREATE OR REPLACE PROCEDURE test IS

n number := 1;
maxNum number;
BEGIN

execute immediate 'create view check_numbers as
  select num from table1
 union
  select num from table2
 union
  select num from table3';

maxNum := EXECUTE IMMEDIATE 'select max(num) from check_numbers'; --I also tried taking out the EXECUTE IMMEDATE here and it still did not work

WHILE n <= maxIpid LOOP
     insert into numList values(n);          
     n := n + 1;
END LOOP;

--Here I will put in the code to compare the two and display the numbers that are in numList but not in Check_numbers

END;
/

Published by: james3302 on August 11, 2010 15:59

James,

The solution to your immediate problem to get the result of the immediate execution in a variable is to use

EXECUTE IMMEDIATE 'select max(num) from check_numbers' into maxNum;

You can also do without running to the immediate assistance

select max(num) into maxNum from check_numbers;

Of course, you should definitely consider using one of the other solutions already provided.

Depending on what you ultimately trying to reach, another option to consider is to get the list of discrepancies between the numbers to help
Method of Tabibitosan of Aketi ({: identifier of the thread = 1005478}).

with t as (
select  1 as n from dual union all
select  2 as n from dual union all
select  7 as n from dual union all
select  8 as n from dual union all
select 11 as n from dual
)
select * from (
select grp, n1, n2, 1+lag(n2,1,0) over(order by n1) as gap_n1, n1-1 as gap_n2
from (
  select grp, min(n) as n1, max(n) as n2
  from (
    select n, n - row_number() over(order by n) as grp
    from t
    )
  group by grp
  )
)
where grp>0
order by grp
;

GRP                    N1                     N2                     GAP_N1                 GAP_N2
---------------------- ---------------------- ---------------------- ---------------------- ----------------------
4                      7                      8                      3                      6
6                      11                     11                     9                      10

Kind regards
Bob

Published by: BobLilly on August 11, 2010 15:00

Tags: Database

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...
...

Edited by: user577229 the 07.06.2011 09:27

Published by: BluShadow on June 8, 2011 08:29
addition of {noformat}

{noformat} tags

If I understand your point, the key concept to understand here is related to "* statement-level Read consistency and coherence of reading at the level of transactions."

From the Manual:
+ "If a SELECTION list contains a function, then the database applies consistency of reading to the statement-level to the level of the SQL statement executed in the PL/SQL function, rather than the parent level SQL code. For example, a function can access a table whose data are changed and committed by another user. For each execution of the function, SELECT a snapshot consistent new reading is established. » +

These two concepts are well explained in the "Oracle® Database Concepts":
http://download.Oracle.com/docs/CD/B19306_01/server.102/b14220/consist.htm#sthref1955

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