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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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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....
Performance surprise with “as” and nullable types
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10 Answers
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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>
);
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How to create a date object from string in javascript [duplicate]
Having this string 30/11/2011 . I want to convert it to date object.
8 Answers
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How to initialize a struct in accordance with C programming language standards
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15 Answers
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