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Lone Learner questions

UPDATE with JOIN syntax for Oracle Database
Why the type of a mock does not match Mock?
An alias defined in a bash script does not work within the same script [duplicate]
C++ error: no matching function for call to 'print_size'
Can a WSGI application tell the web server serving it to send its default HTTP 404 error page?
Can we call va_start() twice without calling va_end() in between?
Why does Elasticsearch _update with "script" using "params" not deleting document?
HTML link does not get focus outline on receiving focus unless textarea has been focussed explicitly
How does the x command in Vim work on text selected in visual mode even if it is not an operator?
Place 'floating' contents at the bottom right of a paragraph of text

Lone Learner answers

Can a WSGI application tell the web server serving it to send its default HTTP 404 error page?
How to make the gx command work for URLs in Vim on XFCE4 Desktop?
Unwanted extra space by \newcommand macro in MathJax
The `uwsgi_modifier1 30` directive is not removing the SCRIPT_NAME from PATH_INFO as documented