Why isn't this declare variable work?

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  Hello
  
  Please inform me how can I declare variables in PL/SQL dynamically (I want used in other projects). I tried the following code, but this error
  
  SQL > /.
  declare
  *
  ERROR on line 1:
  ORA-06550: line 1, column 74:
  PL/SQL: ORA-00933: SQL not correctly completed command
  ORA-06550: line 1, column 35:
  PL/SQL: SQL statement ignored
  ORA-06512: at line 10
  
  -----------------------------------------
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  declare
  v_temp varchar2 (300);
  x varchar2 (20);
  y varchar2 (20);
  
  Start
  BBB: = "X varchar2 (20);"
  y : = '1' ;
  
  run immediately 'declare '.
  || v_temp
  || "start."
  || 'Select name '.
  || "Ali where id =: yy '.
  || ' x using the ' | There
  || ' ; '
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  concerning
  WAel

  user3098640 wrote:
  Hi, thanks a lot for all. OK I'll show you that I want to achieve. So please help me
  refer to the following table it consist of four columns and three rows.
  I only want to show the column that has a value of ZERO : like the following query

  Select REC1 IMAGE_VALUE where corr = 'x' and rec1 = '1';

  Do you want that ZERO or '1 '? Contradict you yourself.

  Good to see you're requirements are clear.

  in this case are easy, but in my case the columns may be more than 100 columns (this is will automatically create - already made the number of columns is not fixed but it start by REC1 REC2, REC3, REC4... etc)
  the question is How can I DISPLAY the columns containing only '1' for specfic "corr" is X, Y or Z in PL - SQL

  Why you have a table that automatically creates with an unknown number of columns?
  It of very bad database design and get the basics of the design by the window completely.

  When you say 'Show' to what it means? SQL and PL/SQL "shows" nothing, because it has no user interface. It simply processes the data, and if these data are not in a known structure at the time where the application has been designed, and all code must be dynamic to try to deal with it. It is simply false in many ways.

  A better structure would be something like this...

  SQL> create table image_value (corr varchar2(20), rec varchar2(10), rec_val varchar2(20));
  
  Table created.
  
  SQL>
  SQL> insert into image_value (corr, rec, rec_val) values ('X','REC1','1');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('X','REC2','0');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('X','REC3','0');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('Y','REC1','0');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('Y','REC2','1');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('Y','REC3','1');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('Z','REC1','1');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('Z','REC2','0');
  
  1 row created.
  
  SQL> insert into image_value (corr, rec, rec_val) values ('Z','REC3','1');
  
  1 row created.
  
  SQL>
  SQL> commit;
  
  Commit complete.
  
  SQL>
  SQL> with r as (select '&Required_Corr' as req_corr from dual)
    2  --
    3  -- end of input
    4  --
    5  select corr
    6        ,max(decode(rn,1,rec)) as c1
    7        ,max(decode(rn,2,rec)) as c2
    8        ,max(decode(rn,3,rec)) as c3
    9        ,max(decode(rn,4,rec)) as c4
   10        ,max(decode(rn,5,rec)) as c5
   11        ,max(decode(rn,6,rec)) as c6
   12        ,max(decode(rn,7,rec)) as c7
   13        ,max(decode(rn,8,rec)) as c8
   14        ,max(decode(rn,9,rec)) as c9
   15        ,max(decode(rn,10,rec)) as c10
   16  from (
   17        select corr, rec, row_number() over (partition by corr order by rec) as rn
   18        from   image_value, r
   19        where  corr = req_corr
   20        and    rec_val = '1'
   21       )
   22  group by corr;
  Enter value for required_corr: X
  old   1: with r as (select '&Required_Corr' as req_corr from dual)
  new   1: with r as (select 'X' as req_corr from dual)
  
  CORR                 C1         C2         C3         C4         C5         C6         C7         C8         C9         C10
  -------------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
  X                    REC1
  
  SQL> /
  Enter value for required_corr: Y
  old   1: with r as (select '&Required_Corr' as req_corr from dual)
  new   1: with r as (select 'Y' as req_corr from dual)
  
  CORR                 C1         C2         C3         C4         C5         C6         C7         C8         C9         C10
  -------------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
  Y                    REC2       REC3
  
  SQL> /
  Enter value for required_corr: Z
  old   1: with r as (select '&Required_Corr' as req_corr from dual)
  new   1: with r as (select 'Z' as req_corr from dual)
  
  CORR                 C1         C2         C3         C4         C5         C6         C7         C8         C9         C10
  -------------------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
  Z                    REC1       REC3
  
  SQL>
  

  And you support the maximum number of values REC you expect.

  Other than that, what you're really talking is a reporting requirement that requires that the data to be read once before, it is then processed and only the required data is queried with a second query. This can be done in PL/SQL using DBMS_SQL (or versions using EXECUTE IMMEDIATE), but really, that should be done by tools that are designed to query data then format and place based on the content of the reporting data.

  Yet, you have not really explained why you are trying to do. It's alright saying you are trying to achieve, but which does not justify as being the right way to do things. What you have shown us so far, is not how to design a database or application code.

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