What Function will replace 0 & NULL?

In Oracle simple update statement, what function should I use to update a column with a new value following below rules:
Replace current "0" or NULL with the new value
If there is an existing value, do not update it
DECODE would work in select statement, but this is update ... SET ...
Thanks

update your_table
set some_column = new_value
where some_column = 0 or some_column is null;
Or, you could use a case statement.

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Hello
I am creating a report showing training attended by employees. I have written a function to do the following:
Parameters 1 - 4 is hard coded for a reason. So we dont worry about them.
5th parameter: :START_DATE represents the date training started
6th parameter: :END_DATE represents the date training ended.
These date parameters are correctly used inside the select statement that the function is built upon. So don't worry that my date parameters are correct/incorrect.
The focus should be on how you use bind variables inside Discoverer Admin. The select at the bottom runs perfectly in Toad and it allows you to use the date parameters as bind variables. But it does not allow it in Discoverer Admin
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Does anyone have a solution for my problem.
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, apps.xxhr_fsc_training_info.xxhr_fsc_training ('B', '02','M', 'N',:START_DATE, :END_DATE)category_B_training
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, apps.xxhr_fsc_training_info.xxhr_fsc_training ('E', '02','M', 'N',:START_DATE, :END_DATE)category_E_training
, apps.xxhr_fsc_training_info.xxhr_fsc_training ('F', '02','M', 'N',:START_DATE, :END_DATE)category_F_training
, apps.xxhr_fsc_training_info.xxhr_fsc_training ('G', '02','M', 'N',:START_DATE, :END_DATE)category_G_training
from dual
Edited by: iandekoker on Jun 8, 2009 9:34 PM

Rod
I have a request. The request is based on various emails written about passing parameters in Discoverer Admin/Desktop. Now if you are experienced and work with set copntext on regular basis then it should be a walk in the park. However if you are new to it like me, then it seems a daunting task. So my request is: Can't you provide us with an example of how to complete the whole process from begin to end using an actual example? I will kick off the process and maybe you can add where i left something out?
Example:
SELECT ENAME, HIRE_DATE
FROM EMP
WHERE HIRE_DATE = :IDATE;
We want to run this select statement in Discoverer Admin, but Admin does not like the :IDATE bind variable. So now we are gonna use SET CONTEXT to find a solution to our problem.
Step1:
First we have to create a context namespace in the database for the Discoverer contexts. Here is the code to create the context. It is okay to also named your function EUL_DISCO as this name would work perfectly for almost everyone. Best is to do all of this in the Apps schema. Copy and paste this code in Toad and F9 it. It should compile successfully
CREATE OR REPLACE CONTEXT eul_disco
USING apps.eul_disco;
Step 2:
Now you need to create a package to enable you to set and retrieve contexts from in Discoverer. Here is the code to create the package and package body. Just copy and paste the code into Toad and F9 (execute) it to create the package.
--Package Spec
CREATE OR REPLACE PACKAGE eul_disco AS
FUNCTION set_context(p_name VARCHAR2, p_value VARCHAR2) RETURN VARCHAR2;
FUNCTION show_context(p_name VARCHAR2) RETURN VARCHAR2;
END eul_disco;
--Package Body
CREATE OR REPLACE PACKAGE BODY eul_disco IS
FUNCTION set_context(p_name VARCHAR2, p_value VARCHAR2)
RETURN VARCHAR2 AS
BEGIN
dbms_session.set_context('EUL_DISCO', p_name, p_value);
RETURN p_value;
END set_context;
FUNCTION show_context(p_name VARCHAR2)
RETURN VARCHAR2 IS
BEGIN
RETURN SYS_CONTEXT('EUL_DISCO', p_name);
END show_context;
END eul_disco;
Step3:
Once you have created this package successfully you need to log into Discoverer Admin. Then use the menu to navigate to Tools > Register PL/SQL Function. A window called 'PL/SQL Functions' will appear. Select the 'Import...' button. A new window called 'Import PL/SQL functions' will appear. Scroll down until you see set_context function. Once you found it click OK to import it to End User Layer. Do the same to import show_context function. Remember there are two functions and you need to import them both. When you are done, click 'Apply' button. Then click 'OK' button. You can double check to make sure your functions have been imported. Just nagivate to Tools > Register PL/SQL function again. When the window 'PL/SQL Functions' appears your function(s) should be in the list on the left hand site. Scroll down untill you find them.
Step4:
Now it is time to set your session parameters in a separate worksheet inside Discovere Desktop from your main reports. The following steps show you how to create a worksheet to define an effective date parameter. The parameter worksheet should be based on a folder that always returns exactly one row.
Log into Discoverer Admin. Open the Business Area you want to use. Then create "New Custom Folder..."
Copy and paste this code (select sydate from dual) inside the New Custom Folder and validate the code. Also rename your folder to 'Set Context Folder'
Step 5
Next log into Discoverer Desktop and choose 'Create New Workbook'. Then choose table layout option. In the available list choose 'Set Context Folder'. When you have highlighted 'Set Context Folder' click on '>' button. Then click then 'Finish' button. Once the workbook is created you will see 1 column called Sysdate and a row with today's date in it. Save this workbook and name this workbook XYZ. You might even rename the sheet to QWE.
Step 6:
Still in Desktop working on XYZ workbook on QWE sheet, click on Tools > Parameters > New. In the 'Name' field enter START_DATE. Next leave 'Create condition with operator' box unticked. Next in 'Prompt' field enter START_DATE. In 'Description' field enter START_DATE. In 'Default' field enter NULL. Click OK button when you are done.
Step 7:
Still in Desktop working on XYZ workbook on QWE sheet, click on Tools > Calculation > New. Click on 'Functions' radio button. Then click on 'Database' folder to expand it. Scroll down till you see 'Set Context' function in the list. Select it and click 'paste >>' button. It will now show: SET_CONTEXT(P_NAME, P_VALUE). Now you need to replace the two parameters (P_NAME, P_VALUE) of the function. Replace P_NAME with 'START_DATE'. When you are done click on Items radio button. Then click on the Parameters folder and select Start_Date.
When you are done it should look like this: SET_CONTEXT('START_DATE',TO_CHAR(:START_DATE))
You might want to rename this calculation to START_DATE
Ps. If you need to create two date parameters START_DATE and END_DATE then you repeat step 7 cause you need one more calculation.
Just replace START_DATE with END_DATE. You also might want to call this second calculation END_DATE. Thus when you are done you will have 2 calculations:
SET_CONTEXT('START_DATE',TO_CHAR(:START_DATE))
SET_CONTEXT('END_DATE',TO_CHAR(:END_DATE))
This is useful when you want date parameters similar to: 'where date between :Start_date and :End_date'
Step 8:
When you now run the XYZ workbook (QWE sheet) it will prompt you for an START_DATE. Enter 10-Jun-2009 (make sure the format you enter the date is similar to the format you have set up in discoverer). Now your XYZ workbook have 2 columns. First column is still called Sysdate with today's date. The second column is called START_DATE with 10-JUN-2009 in it.
Step 9:
Now you want to remove the 'SELECT SYSDATE FROM DUAL' data stored in 'SET CONTEXT FOLDER' from your XYZ workbook (QWE sheet) as you no longer need that. Still working with Desktop inside XYZ workbook on QWE sheet > click on Sheet menu option > then Edit Sheet option. On the Select Items tab click on 'Set Context Folder' and click < button to remove the folder from workbook XYZ. Click OK when done and run the workbook XYZ (sheet QWE) again. Now the workbook XYZ (sheet QWE) should only have one column called START_DATE and 10-Jun-2009 as the only row.
Step 10:
Rob you might want to come in here. It is also useful to create another calculation retrieving the value of the parameter, so that the value entered for the parameter can be seen when the workbook is run. Please give step by step instruction to complete this process
Step 11:
Still remember your initial problem where we wanted to use :IDATE in Discoverer Admin folder, but Discoverer Admin did not like the :IDATE syntax?
SELECT ENAME, HIRE_DATE
FROM EMP
WHERE HIRE_DATE = :IDATE;
Solution:
Well now you just replace :IDATE with TO_DATE(SYS_CONTEXT('EUL_DISCO','START_DATE'))
Log into Discoverer Admin. Open your Business Area. Then create 'New Custom Folder..'.
Copy the code below and paste it into the new custom folder.
Then validate the code.
Rename the new custom folder to 'Solution'
--copy and paste this code into folder 'Solution'
SELECT ENAME, HIRE_DATE
FROM EMP
WHERE HIRE_DATE = TO_DATE(SYS_CONTEXT('EUL_DISCO','START_DATE'))
note: 'EUL_DISCO' is the name of the context and package you created in step1
: 'START_DATE' is the name of the calculation you did in step7
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Click on Menu item called Sheet > New Sheet > choose Table layout > click next > scroll down available folders till you find SQL folder with then name 'Solution'. Select 'Solution' folder and click > then click Finish.
The folder named 'Solution' will be used to populate the newly created sheet with data. You might want to rename the newly created sheet to 'Finally'.
At this point workbook XYZ should have 2 sheets (QWE and Finally).
Sheet 'QWE' contains the parameter and nothing else.
Sheet 'Finally' displays the code found in folder 'Solution'
First you run sheet QWE to set parameter. When prompt for a date enter '10-JUN-2009'. Click OK button.
Then click on sheet 'Finally' to allow the parameter to take effect and do its job. You will see that only data true of 10-JUN-2009 are displayed
Notes:
This is a very simple example. But if you work thru this example, then you will get the concept behind the idea and would you be able to satisfy your own need.

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