How to remove an alias from a command line?
If you want to use the newly defined alias in the current session, issue the following command: To remove an alias added via the command line can be unaliased using unalias command. This was a short example on how to create your own alias and execute frequently used commands without having to type each command again and again.
Why do I need to use alias in Linux?
Linux users often need to use one command over and over again. Typing or copying the same command again and again reduces your productivity and distracts you from what you are actually doing. You can save yourself some time by creating aliases for your most used commands.
How does alias work in order by clause?
The UNION is taken after each sub-select is evaluated. Finally, the resulting rows are sorted according to the columns specified in the ORDER BY clause. TOP clause is executed. Hope this answers your question. Also, it explains why the alias works in ORDER BY clause.
Is it possible to reference aliases in other parts of the query?
The ability to reference aliases in other parts of the query is a feature that many other db platforms have and honestly it annoys me that Microsoft hasn’t considered it a useful enough feature to add it. The HAVING clause is evaluated before the SELECT – so the server doesn’t yet know about that alias.
Why do I need an alias in my terminal?
The problem with that alias is that it will only be available for your current terminal session. If you open new terminal session, the alias will no longer be available. If you wish to save your aliases across sessions you will need a permanent alias.
Can a subshell be turned into a generic alias?
Changing the working directory in a subshell makes it so that the current working directory of the calling shell is not changed, i.e., after having called this command, you would still be located in the same directory where you started. This can not be turned into a generic alias as an alias can not take any arguments.
Where do I save aliases in my shell?
If you wish to save your aliases across sessions you will need a permanent alias. To keep aliases between sessions, you can save them in your user’s shell configuration profile file.