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Is there a REAL performance difference between INT and VARCHAR primary keys?
...ed very frequently. If these queries benefit from eliminating a join, and do not suffer by using a varchar primary key, then do it.
Don't use either strategy for all tables in your database. It's likely that in some cases, a natural key is better, but in other cases a surrogate key is better.
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How to get the last value of an ArrayList
...empty, get throws an IndexOutOfBoundsException. You can find the whole API documentation here.
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Cannot insert explicit value for identity column in table 'table' when IDENTITY_INSERT is set to OFF
...t. In that case the table will keep track of the next free number, and you do not need to generate the OperationID by yourself. The new id can be fetched by SELECT SCOPE_IDENTITY().
– Hakan Winther
Aug 26 '09 at 13:29
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How to solve Permission denied (publickey) error when using Git?
...n: cat id_rsa.pub | pbcopy
On Linux run: cat id_rsa.pub | xclip
On Windows (via Cygwin/Git Bash) run: cat id_rsa.pub | clip
Add your key to your account via the website.
Finally setup your .gitconfig.
git config --global user.name "bob"
git config --global user.email bob@...
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Objective-C: Property / instance variable in category
As I cannot create a synthesized property in a Category in Objective-C, I do not know how to optimize the following code:
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WKWebView not loading local files under iOS 8
...fety checks
if !fileURL.isFileURL {
throw NSError(
domain: "BuggyWKWebViewDomain",
code: 1001,
userInfo: [NSLocalizedDescriptionKey: NSLocalizedString("URL must be a file URL.", comment:"")])
}
try! fileURL.checkResourceIsReachable()
// Cr...
Text Progress Bar in the Console [closed]
I wrote a simple console app to upload and download files from an FTP server using the ftplib.
31 Answers
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How to add border radius on table row
Does anyone know how to style tr as we like?
11 Answers
11
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Master-master vs master-slave database architecture?
...ilability, consistency and complexity. To address the last question first: Does this matter? Yes very much! The choices concerning how your data is to be managed is absolutely fundamental, and there's no "Best Practice" dodging the decisions. You need to understand your particular requirements.
The...
Making a triangle shape using xml definitions?
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In this post I describe how to do it. And here is the XML defining triangle:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<rotate
androi...