Essays

|

Notes

When you are create an object in Oracle Database, default object type will be marked editionable. From 12c onwards, you can mark the objects as noneditionable , and same you cannot edit with create or replace . For altering the same you have to alter the object and change to editionable.

This is applicable to View, Funcitons, Procedure, Trigger, Library, Type.

create or replace noneditionable procedure test_proc ( p int ) as
begin
  null;
end;

select editionable from user_objects
where  object_name = 'test_proc ';

//result
EDITIONABLE   
N

create or replace procedure test_proc ( p int ) as
begin
  dbms_output.put_line ( 'Editionable version' );
end;

//result
ORA-38824: A CREATE OR REPLACE command may not change the EDITIONABLE property of an existing object.

With below you can alter the procedure.

alter procedure test_proc editionable;

create or replace procedure test_proc ( p int ) as
begin
dbms_output.put_line ( 'Editionable version' );
end;

exec test_proc (1);

//result
Editionable version

References

Oracle Doc

If you want to export your Kindle book highlights without the page location and color information, you can follow these steps:

• Export the content in any format you prefer.
• Paste the content in Visual Studio Code or any other text editor that supports regular expressions.
• Use the regular expression Highlight \(yellow\) - Location [0-9]+ in the Find and Replace tool to replace Highlight (yellow) - Location 01.
• Replace all the matches with an empty string.

This will remove the unwanted details from your highlights and leave only the text you want to keep.

The name attribute specifies the name of an <input> element. It is used to reference elements in a JavaScript, or to reference form data after a form is submitted to the server.

Only form elements with a name attribute will have their values passed when submitting a form.

<form action="http://localhost" method="POST">
    <label for="User">User name</label>
    <input type="text" id="User" name="Name" value="bino" />
    <input type="submit" value="submit" />
</form

When you submit the above, server localhost will recive a content like below:

Name=bino

References

w3schools

To read and write without authenticaton in firebase, you need to updated the rules in the database as below.

{
  "rules": {
    ".read": true,
    ".write": true
  }
}

Please note that this allow anyone to fetch and write the data to the database.

The refresh rate of a display is the number of times per second that the image refreshes on the screen. For example, a 60Hz display will update the screen 60 times per second.

References

Windows Doc

To find the constraints in a table

SELECT * FROM ALL_CONSTRAINTS 
WHERE TABLE_NAME='TABLE_NAME' 
AND OWNER = 'OWNER_NAME';

To find the constarints referring to a table

SELECT * FROM ALL_CONSTRAINTS 
WHERE R_CONSTRAINT_NAME IN ( SELECT CONSTRAINT_NAME FROM ALL_CONSTRAINTS WHERE TABLE_NAME='TABLE_NAME' )
AND OWNER = 'OWNER_NAME';

<link rel="stylesheet" href="/path/to/my.css" media="print" onload="this.media='all'">

In the link’s media attribute is set to print. Print is a media type which will apply to the print based media or when user tries to print the page. By applyinhg this the CSS will load Asynchronosuly. But we need to apply the style to the page also, for that we can use the onload attribute to set the link’s media to all when it finishes loading.

References

filamentgroup

The RETURNING INTO clause allows us to return column values for rows affected by DML statements. The returned data could be a single column, multiple columns or expressions.

INSERT INTO t1 VALUES (t1_seq.nextval, 'FOUR')
RETURNING id INTO l_id;

References

Oracle, dba-oracle, oracle base

In windows, deleting node modules takes so much time and sometimes it makes my screen unresponsive. I googled for some soultion and found the below:

Install a npm package called npkill with the command npm i -g npkill.
After installing from the terminal go to the directory from which we want to delete the node modules and type npkill.

The command prompt will list all the node modules and we can select the required folder.
After the secltion, you can press the Space key which will erase the directory in which the cursor is located.

To exit, q, or Ctrl + c.

References

npkill

This view describes all directories accessible to the user.

SELECT * FROM ALL_DIRECTORIES;

This view describes all directories specified for the entire database.

SELECT * FROM DBA_DIRECTORIES;

References

Oracle Doc