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The adjustments to our shell only last for as long as the terminal is open, so we'll need to remember to rerun source env/bin/activate each time you close and open our terminal window.If we switch to work on a different project (with its own environment), we can run deactivate to stop using one environment, and then source env/bin/activate to activate the other.So, each project can have its own dependencies, regardless of what dependencies every other project has.Pip is a tool that fetched Python packages from the Python package Index and its mirrors. It is similar to easy_install but pip was originally written to improve on easy_install.Is there a reason why Oracle is case sensitive and others like SQL Server, and My SQL are not by default?I know that there are ways to enable/disable case sensitivity, but it just seems weird that oracle differs from other databases.In other words, virtualenv is a tool to create isolated Python environments.The virtualenv creates a folder which contains all the necessary executables to use the packages that a Python project would need.
This script, which can be executed with source env/bin/activate, simply adjusts a few variables in our shell (temporarily) so that when we type python, we actually get the Python binary inside the virtualenv instead of the global one: So, now we can just run pip install requests (instead of env/bin/pip install requests) and pip will install the library into the environment, instead of globally.
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SELECT * from MYTABLE, SELECT * from My Table, SELECT * from my Tab Le will all match MYTABLE (note the lack of quotes around the table name).
Here is a nice article on this issue that discusses this issue in more detail and compares databases.