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Add unique constraint to combination of two columns
...tions are expensive).
http://www.sqlperformance.com/2012/08/t-sql-queries/error-handling
http://www.mssqltips.com/sqlservertip/2632/checking-for-potential-constraint-violations-before-entering-sql-server-try-and-catch-logic/
If you want to prevent exceptions from bubbling up to the application, w...
How to delete images from a private docker registry?
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Getting unsupported error. I have given proper digest value as the reference.
– Winster
Feb 22 '18 at 6:36
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How to justify a single flexbox item (override justify-content)
You can override align-items with align-self for a flex item.
I am looking for a way to override justify-content for a flex item.
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javascript i++ vs ++i [duplicate]
... @aelgoa: Most of the time the difference is within the margin error, and the rest of the time there is no consistent result. If you don't use the value of the expression, theoretically there should be no difference at all, as the compiler should optimise it to the same operation.
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_csv.Error: field larger than field limit (131072)
...Update
As Geoff pointed out, the code above might result in the following error: OverflowError: Python int too large to convert to C long.
To circumvent this, you could use the following quick and dirty code (which should work on every system with Python 2 and Python 3):
import sys
import csv
max...
Adding minutes to date time in PHP
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$minutes_to_add = 5;
$time = new DateTime('2011-11-17 05:05');
$time->add(new DateInterval('PT' . $minutes_to_add . 'M'));
$stamp = $time->format('Y-m-d H:i');
The ISO 8601 standard for duration is a string in the form of P{y}Y{m1}M{d}DT{h}H{m2}M{s}S where the {*} parts...
How to find the JVM version from a program?
...ick Floyd
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What's the @ in front of a string in C#?
This is a .NET question for C# (or possibly VB.net), but I am trying to figure out what's the difference between the following declarations:
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How to create a self-signed certificate with OpenSSL
...AN through the configuration file with the line subjectAltName = @alternate_names (there's no way to do it through the command line). Then there's an alternate_names section in the configuration file (you should tune this to suit your taste):
[ alternate_names ]
DNS.1 = example.com
DNS.2 ...
What is the formal difference in Scala between braces and parentheses, and when should they be used?
...+
2
3
}
method(
1 +
2
3
)
The first compiles, the second gives error: ')' expected but integer literal found. The author wanted to write 1 + 2 + 3.
One could argue it’s similar for multi-parameter methods with default arguments; it’s impossible to accidentally forget a comma to separ...