How a Variable are assigned just by being declared.

Hello

I'm new here. We use the Oracle 11.2. I have a question of PL/SQL.

There is code below that takes variables in the DECLARE section and declares the variable v_sum_prcs_end that see you it used in the following select statement.

Is there WAY TO this variable might have gotten one assignment by default other than NULL if not initialized? This variable is not mentioned anywhere before in this procedure. It is a procedure doesn't not part of a package.
          LOOP
               <<Execute_Rule>>
               DECLARE
               v_sum_prcs_start DATE := TO_DATE ('19000101', 'YYYYMMDD');
               v_sum_prcs_end DATE;

               CURSOR PRD_DIM IS
                    SELECT *
                    FROM (
                         SELECT *
                         FROM (
                                SELECT *
                                FROM PRD_DIM_SRC
                                WHERE wk_ending_dt BETWEEN v_sum_prcs_end - ((v_row_PRD_DIM_RUL.span_num_wks * 7) - 7 ) AND v_sum_prcs_end
                                ORDER BY wk_ending_dt)
                         WHERE ROWNUM <= v_row_PRD_DIM_RUL.max_num_wks)
                    WHERE wk_ending_dt > v_sum_prcs_start
                    ORDER BY wk_ending_dt ASC;
It is in a loop, as you can see, and he get initialized after this. Of course when the loop returns once again, it will have a value, but at the first pass, it is just ZERO? and if so the query returns all rows?

Thank you

Hello

963236 wrote:
Hello

I'm new here. We use the Oracle 11.2. I have a question of PL/SQL.

Whenever you have any questions, please post a complete script that people can use to recreate the problem and test their ideas. Include a full procedure or ananoymous PL/SQL block, and, if it is a procedure or a function, the code that calls it. Include CREATE TABLE and INSERT all necessary tables for instructions. See the FAQ forum<>
Simplify the code you post as much as possible. In this case, the problem seems to depend on if or how a DATE variable to get the value before using a cursor. You can probably show only with a slider to 5 lines, without any of subqueries, using the column hiredate in scott.emp, which is widely available, so you don't have to post CREATE TABLE and INSERT statements for her.

There is code below that takes variables in the DECLARE section and declares the variable v_sum_prcs_end that see you it used in the following select statement.

Is there WAY TO this variable might have gotten one assignment by default other than NULL if not initialized? This variable is not mentioned anywhere before in this procedure. It is a procedure doesn't not part of a package.

What you are showing is the DECLARE section. You're not showing how the cursor is open. If v_sum_prcs_end has a value when the cursor is actually used, then you must be giving the value before opening the cursor. (Add a few calls to dbms_output.put_line to display its values at various points in the code.) If there is nothing mysterious past, it will happen in the BEGIN section, which has no validation, and not DECLARE section.

The only ways I know to which gives a value to a variable in a PL/SQL are:
(1) using the variable on the left side of the: operator, =
(2) use it in the clause of SELECT INTO... IN
(3) if it is an argument, which gives a default value (which is clearly not the case in this issue.)
(4) use it as an OUT or IN ARGUMENT to another procedure. (This is not really a separate way to set the value, because the procudeure must assign the new value using first 3 methods, or call another procedure that does.)
Again, if the variable has a value when you open the slider, then I think you're one of the foregoing, before opening the cursor.

Moreover, why you open a cursor inside a loop? There is almost always a more efficient way to get rid of the loop and do everything in the cursor. Like a lot of work as long as you can in the SQL statement and only use PL/SQL constructs, such as loops, when there is no other choice.

Tags: Database

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