zsh: no matches found

"zsh: no matches found" typically occurs in the Zsh shell when you use wildcard characters (such as *, ?, or []) in a command, and there are no files or directories that match the specified pattern in the current directory.

Here are a few common scenarios where you might encounter this error:
Using a command with a wildcard pattern that doesn't match any files:
$ ls *.xyz
zsh: no matches found: *.xyz

In this example, Zsh couldn't find any files in the current directory with the ".xyz" extension.
Using a command with a wildcard pattern, but the pattern itself doesn't match anything:

$ echo [a-z]
zsh: no matches found: [a-z]

If there are no lowercase letters in the current directory, the [a-z] pattern won't match anything.

To resolve this issue, you can do the following:
1.Double-check your command or wildcard pattern to ensure it matches existing files or directories in the current directory.
2.Use proper escaping or quoting if necessary. For example, if you want to list files with a literal asterisk in their names, you can use single or double quotes to prevent globbing:

$ ls '*.*'

If you want to use a wildcard pattern to match files in subdirectories as well, consider enabling the globstar option in Zsh:

$ setopt globstar
$ ls **/*.txt

The ** pattern will match files in subdirectories.

How to Delete a Primary Key Index in Oracle

Deleting a primary key index can be a complex task, as it involves modifying the structure of the database table. Here are the steps you can follow to delete a primary key index:

Identify the name of the primary key index: 

SELECT index_name FROM dba_constraints WHERE table_name = 'table_name' AND constraint_type = 'P';

Drop the primary key constraint: Before you can drop the primary key index, you must first drop the primary key constraint. 
ALTER TABLE table_name DROP PRIMARY KEY;

Drop the primary key index: Once the primary key constraint has been dropped, you can then drop the primary key index

DROP INDEX index_name ON table_name;

It's important to note that deleting a primary key index will also remove the associated primary key constraint, which can have implications for data integrity and referential integrity in your database. Be sure to fully understand the implications of removing a primary key index before proceeding.