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Strings as Primary Keys in SQL Database [closed]
...Good explanation. But holds this true for all SQL databases? I've heard of MySQL performance issues when using random UUID as primary key.
– hgoebl
Aug 27 '17 at 11:08
add a c...
Python: Get relative path from comparing two absolute paths
... print os.path.commonprefix(['/tmp', '/usr/var']) # No common prefix: the root is the common prefix
'/'
You can thus test whether the common prefix is one of the paths, i.e. if one of the paths is a common ancestor:
paths = […, …, …]
common_prefix = os.path.commonprefix(list_of_paths)
if c...
Django CharField vs TextField
...nce among these three types", but AFAIK there are some differences in e.g. MySQL, so this is something to keep in mind.
A good rule of thumb is that you use CharField when you need to limit the maximum length, TextField otherwise.
This is not really Django-specific, also.
...
XPath contains(text(),'some string') doesn't work when used with node with more than one Text subnod
...n:
//*[contains(text(), 'ABC')]
//* matches any descendant element of the root node. That is, any element but the root node.
[...] is a predicate, it filters the node-set. It returns nodes for which ... is true:
A predicate filters a node-set [...] to produce a new node-set. For each node in the n...
Is it acceptable and safe to run pip install under sudo?
...sudo pip'?
To install Python package in your home directory you don't need root privileges. See description of --user option to pip.
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Installing PG gem on OS X - failure to build native extension
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n.b. If installing as root (for whatever reason), sudo goes before the variable: sudo ARCHFLAGS="-arch x86_64" gem install pg
– Noach Magedman
Aug 12 '14 at 21:40
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Copy values from one column to another in the same table
...ble name and it's surrounded by grave accent (aka back-ticks `) as this is MySQL convention to escape keywords (and TABLE is a keyword in that case).
BEWARE, that this is pretty dangerous query which will wipe everything in column test in every row of your table replacing it by the number (regardle...
How to use OpenFileDialog to select a folder?
...ch is just the FolderBrowserDialog). It is completely unusable: a bunch of root dirs, a missing favorites panel, and the most horrible — you can't even paste a path there! And now as a programmer I see an advice to use it… Please, don't do it.
– Hi-Angel
Au...
SQL Server Installation - What is the Installation Media Folder?
...vices_x64.exe")
Navigate to the "options" tab
Copy the "Installation Media Root Directory" (should look something like the below snipping)
Paste it into the open "Browse for SQL server Installation Media" window
Save yourself the hastle of renaming and unzipping etc.!
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Google Espresso or Robotium [closed]
...of the time i’m getting AppNotIdleException. Im unable to figure out the root cause. Can you please help me out.
– Naresh Gunda
Mar 24 '17 at 11:41
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