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How important is the order of columns in indexes?
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Look at an index like this:
Cols
1 2 3
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| | 1 | |
| A |---| |
| | 2 | |
|---|---| |
| | | |
| | 1 | 9 |
| B | | |
| |---| |
| | 2 | |
| |---| |
| | 3 | |
|---|---| |
See how restricting on A first, as your...
Measure time in Linux - time vs clock vs getrusage vs clock_gettime vs gettimeofday vs timespec_get?
... This clock wraps around once it tops out (this typically happens after ~2^32 ticks, which is not very long for a 1 MHz clock). man clock says that since glibc 2.18 it is implemented with clock_gettime(CLOCK_PROCESS_CPUTIME_ID, ...) in Linux.
clock_gettime(CLOCK_MONOTONIC, ...) provides nanosecond ...
Styling text input caret
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answered May 4 '15 at 13:43
Nestor BritezNestor Britez
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What is jQuery Unobtrusive Validation?
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KyleMit
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answered Jul 18 '12 at 6:00
bertlbertl
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When to use Amazon Cloudfront or S3
Are there use cases that lend themselves better to Amazon cloudfront over s3 or the other way around? I'm trying to understand the difference between the 2 through examples.
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What is the usefulness of PUT and DELETE HTTP request methods?
...source with that URI …
For the full specification visit:
http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html
Since current browsers unfortunately do not support any other verbs than POST and GET in HTML forms, you usually cannot utilize HTTP to it's full extent with them (you can still hij...
The simplest possible JavaScript countdown timer? [closed]
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Declaration/definition of variables locations in ObjectiveC?
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NolanDC
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answered Sep 28 '12 at 1:38
DrummerBDrummerB
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C# List of objects, how do I get the sum of a property
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316
using System.Linq;
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double total = myList.Sum(item => item.Amount);
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Using OR in SQLAlchemy
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340
From the tutorial:
from sqlalchemy import or_
filter(or_(User.name == 'ed', User.name == 'wen...