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What are the best practices for using a GUID as a primary key, specifically regarding performance?
...ry Key in almost all tables and I have read that there are issues about performance when using GUID as Primary Key. Honestly, I haven't seen any problem, but I'm about to start a new application and I still want to use the GUIDs as the Primary Keys, but I was thinking of using a Composite Primary Ke...
搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...照一些属性来判断谁应该胜出。这个属性可以是一个静态ID，也可以是更新的度量像最近一次事务ID（最新的节点会胜出）。详情请参考NoSQL数据库分布式算法的协调者竞选还有维基百科的解释 。
选举 那mongodb是怎进行选举的呢...
Declare and initialize a Dictionary in Typescript
...
Always forget this syntax for some reason!
– eddiewould
Jul 31 '18 at 4:04
16
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Check if a row exists, otherwise insert
...
I assume a single row for each flight? If so:
IF EXISTS (SELECT * FROM Bookings WHERE FLightID = @Id)
BEGIN
--UPDATE HERE
END
ELSE
BEGIN
-- INSERT HERE
END
I assume what I said, as your way of doing things can overbook a flight, as it wi...
Download File Using Javascript/jQuery
... document.getElementById('my_iframe').src = url;
};
</script>
To force the browser to download a file it would otherwise be capable of rendering (such as HTML or text files), you need the server to set the file's MIME Type to a nonsensical value, such as application/x-please-download-me or...
How to detect UI thread on Android?
...thod isCurrentThread. You could get the mainLooper and see if it's the one for the current thread this way:
Looper.getMainLooper().isCurrentThread()
It's practically the same as:
Looper.getMainLooper().getThread() == Thread.currentThread()
but it could be a bit more readable and easier to reme...
Android - border for button
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thanks.+1 for this.After saving it into drawable folder as a xml file.How can we use it ?
– Android Killer
Oct 7 '11 at 18:26
...
Practical uses for AtomicInteger
...n see, it basically works almost the same way as incrementAndGet(), but performs arbitrary calculation (calculateNext()) instead of increment (and processes the result before return).
share
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impro...
SQL Server: What is the difference between CROSS JOIN and FULL OUTER JOIN?
...ery's where clause, and in cases where the on condition can't be satisfied for those rows it puts null values in for the unpopulated fields.
This wikipedia article explains the various types of joins with examples of output given a sample set of tables.
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How to apply CSS to iframe?
... some iframe sections (to display RSS links). How can I apply the same CSS format from the main page to the page displayed in the iframe?
...