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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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371
psql's inline help:
\h ALTER TABLE
Also documented in the postgres docs (an excellent resourc...
How to get an IFrame to be responsive in iOS Safari?
...onsive as well. In theory it's simple, simply aider use <iframe width="100%"></iframe> or set the CSS width to iframe { width: 100%; } however in practice it's not quite that simple, but it can be.
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Git Gui: Perpetually getting “This repository currently has approximately 320 loose objects.”
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edited Jun 20 at 9:12
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answered Jan 30 '14 at 13:53
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Groovy: what's the purpose of “def” in “def x = 0”?
...script and groovy treats it (mostly) like a globally scoped variable:
x = 1
assert x == 1
assert this.binding.getVariable("x") == 1
Using the def keyword instead does not put the variable in the scripts bindings:
def y = 2
assert y == 2
try {
this.binding.getVariable("y")
} catch (groovy....
Unresolved external symbol on static class members
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147
If you are using C++ 17 you can just use the inline specifier (see https://stackoverflow.com/a...
Performance surprise with “as” and nullable types
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How can I respond to the width of an auto-sized DOM element in React?
...; {
if (!offsetWidth) return null;
const numColumns = Math.max(1, Math.floor(offsetWidth / 200));
return renderColumns(numColumns);
}}
</Responsive>
);
share
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improve...
Margin-Top not working for span element?
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311
Unlike div, p 1 which are Block Level elements which can take up margin on all sides,span2 cann...