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Postgres unique constraint vs index
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Let's check uniqueness, just in case.
test=# insert into master values (0, 0);
INSERT 0 1
test=# insert into master values (0, 1);
ERROR: duplicate key value violates unique constraint "master_con_id_key"
DETAIL: Key (con_id)=(0) already exists.
test=# insert into master values (1, 0);
ERROR: ...
What is the use for Task.FromResult in C#
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answered Oct 31 '13 at 0:40
Stephen ClearyStephen Cleary
349k6363 gold badges575575 silver badges699699 bronze badges
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Sending a message to nil in Objective-C
As a Java developer who is reading Apple's Objective-C 2.0 documentation: I wonder what " sending a message to nil " means - let alone how it is actually useful. Taking an excerpt from the documentation:
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How do I tell matplotlib that I am done with a plot?
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edited Feb 7 '12 at 12:04
Tom
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answered Apr ...
How to add multi line comments in makefiles
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answered Dec 20 '10 at 20:10
Eric MelskiEric Melski
14.5k33 gold badges3030 silver badges4545 bronze badges
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Why is MySQL's default collation latin1_swedish_ci?
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109
The bloke who wrote it was co-head of a Swedish company.
Possibly for similar reasons, Microso...
Change text from “Submit” on input tag
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answered Dec 23 '12 at 0:00
Ry-♦Ry-
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How to only find files in a given directory, and ignore subdirectories using bash
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205
If you just want to limit the find to the first level you can do:
find /dev -maxdepth 1 -name...
How to sort an array of associative arrays by value of a given key in PHP?
...'price'];
}
array_multisort($price, SORT_DESC, $inventory);
As of PHP 5.5.0 you can use array_column() instead of that foreach:
$price = array_column($inventory, 'price');
array_multisort($price, SORT_DESC, $inventory);
s...
Is short-circuiting logical operators mandated? And evaluation order?
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edited Sep 23 '11 at 15:07
answered Mar 10 '09 at 0:37
Al...