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SQL JOIN - WHERE clause vs. ON clause
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They are not the same thing.
Consider these queries:
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
WHERE Orders.ID = 12345
and
SELECT *
FROM Orders
LEFT JOIN OrderLines ON OrderLines.OrderID=Orders.ID
AND Orders.ID = 1234...
How can I get a user's media from Instagram without authenticating as a user?
I'm trying to put a user's recent Instagram media on a sidebar. I'm trying to use the Instagram API to fetch the media.
20 ...
Converting JSON data to Java object
... Google's Gson as a potential JSON plugin. Can anyone offer some form of guidance as to how I can generate Java from this JSON string?
Google Gson supports generics and nested beans. The [] in JSON represents an array and should map to a Java collection such as List or just a plain Java array. The ...
Naming “class” and “id” HTML attributes - dashes vs. underlines [closed]
<div id="example-value"> or <div id="example_value"> ?
8 Answers
8
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Is there a MySQL option/feature to track history of changes to records?
...he business requirement is "I want to audit the changes to the data - who did what and when?", you can usually use audit tables (as per the trigger example Keethanjan posted). I'm not a huge fan of triggers, but it has the great benefit of being relatively painless to implement - your existing code ...
How to implement Android Pull-to-Refresh
In Android applications such as Twitter (official app), when you encounter a ListView, you can pull it down (and it will bounce back when released) to refresh the content.
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Calling a Fragment method from a parent Activity
I see in the Android Fragments Dev Guide that an "activity can call methods in a fragment by acquiring a reference to the Fragment from FragmentManager, using findFragmentById() or findFragmentByTag() ."
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SQL Server Insert if not exists
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instead of below Code
BEGIN
INSERT INTO EmailsRecebidos (De, Assunto, Data)
VALUES (@_DE, @_ASSUNTO, @_DATA)
WHERE NOT EXISTS ( SELECT * FROM EmailsRecebidos
WHERE De = @_DE
AND Assunto = @_ASSUNTO
AND Data = @_D...
What is the X-REQUEST-ID http header?
...s (that a client can see) with server logs (that the server can see).
The idea of the X-Request-ID is that a client can create some random ID and pass it to the server. The server then include that ID in every log statement that it creates. If a client receives an error it can include the ID in a b...
How did Google manage to do this? Slide ActionBar in Android application
I really want to implement this (the side navigation) in an app of my own, does anyone know how Google managed to do this?
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