Selection of column dynamic Collection

Hi gurus,

I have a little problem with a collection.

I have a collection with a type of pins. The selected cell may contain 28, 29,..., 33.

Later, I want to count the lines of the following collection, where (in this example) c033 is not null. The variable is then used as a string, not a column.

How can I use the variable as a column in the 'where' - clause?

Here is my sql query:

declare
l_type_position varchar2 (4);  -content will be: c033
l_types number (3.0)

Start

-Select the dynamic column for the next newsletter

Select 'c0 ' | (c009) - c009 = 33
in l_type_position
of apex_collections

where collection_name = "UPLOAD_HEAD";

Select count (l_type_position)
in l_types
of apex_collections

where collection_name = "SPREADSHEET_CONTENT."
-folowing line error occurse

and l_type_position is not null;   -= and c033 is not null;

end;

Thanks for help.

This can be done using lexical replacement and dynamic SQL (as always, check for possible code SQL injection):

declare

  l_type_position varchar2(4);  --content will be: c033
  l_types number(3,0);

begin

  -- select the dynamic column for the next statement
  select 'c0'||(c009)   -- c009 = 33
  into l_type_position
  from apex_collections
  where  collection_name = 'UPLOAD_HEAD';

  -- check for SQL injection
  l_type_position := dbms_assert.simple_sql_name(l_type_position);

  -- count collection rows
  execute immediate q'{
      select count(}' || l_type_position || q'{)
      from apex_collections
      where  collection_name = 'SPREADSHEET_CONTENT'}'
    into
      l_types;
   ...
  end;

However, it is possible that it is a question of XY. If further information on the nature of the obligation provided that it might be possible to identify a clearer and more secure solution using SQL static.

Tags: Database

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