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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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select <column> from <table> group by 1 having count(*) > 1; will give a report on duplicated values.
– Jasen
Aug 26 '16 at 22:57
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Creating a textarea with auto-resize
... observe(text, 'keydown', delayedResize);
text.focus();
text.select();
resize();
}
textarea {
border: 0 none white;
overflow: hidden;
padding: 0;
outline: none;
background-color: #D0D0D0;
}
<body onload="init();">
<textarea rows="1" style="he...
How do I run a Python program in the Command Prompt in Windows 7?
...you have Python2.7 installed
Goto the Start Menu
Right Click "Computer"
Select "Properties"
A dialog should pop up with a link on the left called "Advanced system settings". Click it.
In the System Properties dialog, click the button called "Environment Variables".
In the Environment Variables di...
How many bytes does one Unicode character take?
...fer UTF-16 over UTF-8, for instance. Developers of different software may select different encodings based upon which Unicode characters are more likely to be used. In China/Japan for instance, UTF-16 (2-bytes) makes more sense than UTF-8 for them, because the same characters often would need twice...
How can I profile C++ code running on Linux?
... Another nice introduction to perf exists at archive.li/9r927#selection-767.126-767.271 (Why the SO gods decided to delete that page from the SO knowledge base is beyond me....)
– ragerdl
Forcing a WPF tooltip to stay on the screen
...to persist longer without further fanfare. Doing this still allows you to selectively apply a smaller value in context-specific places, as well, exactly as in the other answer. (But as always, this is only valid if you are the application -- if you're writing a control library or something else th...
In an array of objects, fastest way to find the index of an object whose attributes match a search
...ANSWER is the most EFFICIENT since it doesn't iterate the whole array. The selected answer will map complete array and then findIndex which is bound to iterate through whole array once
– Karun
Aug 2 '19 at 11:30
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How can I push a local Git branch to a remote with a different name easily?
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Rebase is a smart merge. Then push to master again and you’ll see the selected feature branch as master on the new repo.
Optional:
git remote rm upstream
git remote add upstream new-repo-url
share
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Draw multi-line text to Canvas
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You can get the metrics for a selected character, e.g. font.measure("Y")
– GregD
Apr 10 at 18:41
add a comment
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Why is IoC / DI not common in Python?
...s great use of inversion of control. For instance, the database server is selected by the configuration file, then the framework provides appropriate database wrapper instances to database clients.
The difference is that Python has first-class types. Data types, including classes, are themselves ...